mirror of https://github.com/tLDP/LDP
updated
This commit is contained in:
gferg
parent
98a65dd19c
commit
34aacdcf72
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@ -6,6 +6,123 @@
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http://personal.riverusers.com/~thegrendel/Change.log
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------------------------------------------------------------------------
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Version 3.6
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Pokeberry release, 08/28/05
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1) In "Special Characters" chapter:
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At "-" (redirection from/to stdin or stdout [dash]) entry,
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corrected comments.
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(Thank you, Frank Wang.)
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Replaced flawed first example at "brace expansion" entry.
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Added quoting comment at "whitespace" entry.
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2) In "Operators" subsection of "Operations and Related Topics" chapter:
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Removed unnecessary "echo" from modulo operator usage example.
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(Thank you, Pasha Zubkov.)
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3) In "/proc" section of "/dev and /proc" chapter:
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Added comment to "pid-identifier.sh" example, per Teemu Huovila.
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(Thanks!)
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4) In "Testing and Branching" section of "Loops and Branches" chapter:
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Changed description of "case" construct from "equivalent of"
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to "analog to" "switch" in C/C++.
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(Thank you, Teemu Huovila.)
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5) In "Communications Commands" section of "External Commands" chapter:
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Added "rsync" entry.
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6) In "Miscellaneous Commands" section of "External Commands" chapter:
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Added additional usage example at "jot/seq" entry.
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7) In "Internal Commands and Builtins" chapter:
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Added "testing 'false'" to "false" entry example.
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(Thank you, Joe Friedrichsen for the suggestion.)
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At "getopts" entry, made corrections in description of behavior of
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$GETOPTS.
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(Thank you, Pharis Monalo.)
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At "source" entry, added notes about passing arguments to "sourced"
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file and using a "return" to pass control back to the calling script.
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Added "caller" entry.
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8) In "Contributed Scripts" appendix:
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Made changes to "whx.sh" script.
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9) In "Test Constructs" section of "Tests" chapter:
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Fixed up "ex.11.sh" example for difference in Bash 3.x behavior.
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(Thank you, Frank Wang.)
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10) In "Internal Variables" section of "Variables Revisited" chapter:
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Fixed up comments in "t-out.sh" example to reflect changes
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in Bash 3.x.
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(Thank you, Frank Wang.)
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Fixed up explanation of "anomalous" output given by ${PIPESTATUS[@]}
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in certain situations.
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(Thank you, Frank Wang, for providing Chet Ramey's explanation.)
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11) In "Typing Variables" section of "Variables Revisited" chapter:
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Added caution + example of how "typeset" restricts the scope of a
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variable.
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(Thank you, Michael Iatrou.)
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12) In "File and Archiving Commands" section of "External Commands" Chapter:
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At "file" entry, fixed typo (/usrlocal/bin => /usr/local/bin).
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Fixed error in "strip-comments.sh" example script.
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(Thank you, Jesse Gough.)
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13) In "Complex Commands" section of "External Commands" Chapter:
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At "xargs" entry, added extra usage example.
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At "expr" entry, added example of illegal arithmetic operation.
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14) In "Here Documents" chapter:
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Added "self-document2.sh" example.
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15) In "$RANDOM" section of "Variables Revisited" chapter:
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Added Frank Wang's alternative to jipe's example.
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16) In "Quoting" chapter:
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Split the chapter into introduction and "Quoting Variables" and
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"Escaping" sections.
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Corrected note about unquoted "grep" . . .
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Added discussion about quoting correcting echo's appetite for newlines.
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Clarified explanation of referencing quoted variables
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and added footnote.
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Amended tip about double quotes being necessary only to prevent word
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splitting.
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(Thank you, Harald Koenig.)
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17) In "Local Variables" section of "Functions" chapter:
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In footnoted example of a segfaulting recursive function,
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added an "echo" to properly exercise the function.
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(Thank you, Dr. Roland Sonnenschein.)
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18) In "Debugging" chapter:
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At listing of "Tools for debugging non-working scripts,"
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added list item for "$LINENO" variable and "caller" builtin.
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At "trap" entry, replaced buggy "multiple-processes.sh" example.
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(Thank you, Tedman Eng.)
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19) In "Copyright" chapter:
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Updated licensing terms to give the LDP the right to reassign custodianship
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of the book in the event the author cannot be contacted.
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20) In "Bibliography" section:
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Added entry for Peter Knowles' booklistgen.sh --
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Sony Librie booklist generator -- making possible
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Linux access to this neat e-book reader.
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21) Corrected spelling of the name of contributor Stéphane Chazelas
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in multiple places.
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(Thank you, Bertrand Mollinier Toublet, for pointing out these
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embarrassing typos.)
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22) Various changes and fixups in example scripts.
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Version 3.5
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Boxberry release, 06/05/05
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@ -3194,7 +3311,7 @@ In "External Filters, Programs, and Commands" section:
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99) Fixed other minor typos in the document.
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100) Stephané Chazelas sent in long lists of corrections and suggestions.
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100) Stéphane Chazelas sent in long lists of corrections and suggestions.
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Bug fixes, improvements, and comments on "ex2.sh" example.
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Bug fixes and improvements to "ex3.sh" example.
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Improvement on "ex4.sh", "ex5.sh", and "ex14.sh" examples.
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@ -48,9 +48,10 @@ is-spammer.sh (comments on lines 4, 35, and 51)
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bashrc (comments on lines 596 and 618)
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commentblock.sh (lines 4 and 23)
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self-document.sh (line 14)
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self-document2.sh (line 8)
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dev-tcp.sh (line 14)
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archiveweblogs.sh (comment in line 4)
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multiple-processes.sh (line 61)
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multiple-processes.sh (line 143)
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directory-info.sh (lines 36 and 166)
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catscripts.sh (lines 12 and 21)
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is_spammer.bash (comments on various lines)
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@ -60,4 +61,4 @@ Hash.lib, (comments in lines lines 103 and 116: & --> &)
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hash-example.sh (comment in line 3: < --> <, > --> >)
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quote-fetch.sh (comment in line 26: & --> &)
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ftpget.sh (comment in line 28)
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whx.sh (comment in line 230)
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whx.sh (comment in line 259)
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File diff suppressed because it is too large
Load Diff
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@ -14,8 +14,13 @@ fi
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filename=$1
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column_number=$2
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# Passing shell variables to the awk part of the script is a bit tricky.
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# See the awk documentation for more details.
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# Passing shell variables to the awk part of the script is a bit tricky.
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# One method is to strong-quote the Bash-script variable
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#+ within the awk script.
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# $'$BASH_SCRIPT_VAR'
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# ^ ^
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# This is done in the embedded awk script below.
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# See the awk documentation for more details.
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# A multi-line awk script is invoked by: awk ' ..... '
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@ -31,8 +31,11 @@ fi
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echo
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if /usr/bin/[ -z "$1" # Again, functionally identical to above.
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# if /usr/bin/[ -z "$1" ] # Works, but gives an error message.
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if /usr/bin/[ -z "$1" ] # Again, functionally identical to above.
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# if /usr/bin/[ -z "$1" # Works, but gives an error message.
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# # Note:
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# This has been fixed in Bash, version 3.x.
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then
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echo "No command-line arguments."
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else
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@ -1,8 +1,90 @@
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#!/bin/bash
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# multiple-processes.sh: Run multiple processes on an SMP box.
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# parent.sh
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# Running multiple processes on an SMP box.
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# Author: Tedman Eng
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# Script written by Vernia Damiano.
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# Used with permission.
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# This is the first of two scripts,
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#+ both of which must be present in the current working directory.
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LIMIT=$1 # Total number of process to start
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NUMPROC=4 # Number of concurrent threads (forks?)
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PROCID=1 # Starting Process ID
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echo "My PID is $$"
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function start_thread() {
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if [ $PROCID -le $LIMIT ] ; then
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./child.sh $PROCID&
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let "PROCID++"
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else
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echo "Limit reached."
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wait
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exit
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fi
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}
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while [ "$NUMPROC" -gt 0 ]; do
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start_thread;
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let "NUMPROC--"
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done
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while true
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do
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trap "start_thread" SIGRTMIN
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done
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exit 0
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# ======== Second script follows ========
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#!/bin/bash
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# child.sh
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# Running multiple processes on an SMP box.
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# This script is called by parent.sh.
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# Author: Tedman Eng
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temp=$RANDOM
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index=$1
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shift
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let "temp %= 5"
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let "temp += 4"
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echo "Starting $index Time:$temp" "$@"
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sleep ${temp}
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echo "Ending $index"
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kill -s SIGRTMIN $PPID
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exit 0
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# ======================= SCRIPT AUTHOR'S NOTES ======================= #
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# It's not completely bug free.
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# I ran it with limit = 500 and after the first few hundred iterations,
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#+ one of the concurrent threads disappeared!
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# Not sure if this is collisions from trap signals or something else.
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# No doubt someone may spot the bug and will be writing
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#+ . . . in the future.
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# ===================================================================== #
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# ----------------------------------------------------------------------#
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#################################################################
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# The following is the original script written by Vernia Damiano.
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# Unfortunately, it doesn't work properly.
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#################################################################
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#!/bin/bash
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# Must call script with at least one integer parameter
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#+ (number of concurrent processes).
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@ -24,33 +106,33 @@ shift
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PARAMETRI=( "$@" ) # Parameters of each process
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function avvia() {
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local temp
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local index
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temp=$RANDOM
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index=$1
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shift
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let "temp %= $TEMPO"
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let "temp += 1"
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echo "Starting $index Time:$temp" "$@"
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sleep ${temp}
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echo "Ending $index"
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kill -s SIGRTMIN $$
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local temp
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local index
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temp=$RANDOM
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index=$1
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shift
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let "temp %= $TEMPO"
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let "temp += 1"
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echo "Starting $index Time:$temp" "$@"
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sleep ${temp}
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echo "Ending $index"
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kill -s SIGRTMIN $$
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}
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function parti() {
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if [ $INDICE -gt 0 ] ; then
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avvia $INDICE "${PARAMETRI[@]}" &
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let "INDICE--"
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else
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trap : SIGRTMIN
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fi
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if [ $INDICE -gt 0 ] ; then
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avvia $INDICE "${PARAMETRI[@]}" &
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let "INDICE--"
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else
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trap : SIGRTMIN
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fi
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}
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trap parti SIGRTMIN
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while [ "$NUMPROC" -gt 0 ]; do
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parti;
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let "NUMPROC--"
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parti;
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let "NUMPROC--"
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done
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wait
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@ -18,6 +18,10 @@ pidno=$( ps ax | grep $1 | awk '{ print $1 }' | grep $1 )
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# Checks for pid in "ps" listing, field #1.
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# Then makes sure it is the actual process, not the process invoked by this script.
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# The last "grep $1" filters out this possibility.
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#
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# pidno=$( ps ax | awk '{ print $1 }' | grep $1 )
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# also works, as Teemu Huovila, points out.
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if [ -z "$pidno" ] # If, after all the filtering, the result is a zero-length string,
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then # no running process corresponds to the pid given.
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echo "No such process running."
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@ -31,7 +31,7 @@ fi
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#--------
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sed '
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/^\/\*/d
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/.*\/\*/d
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/.*\*\//d
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' $1
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#--------
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# Easy to understand if you take several hours to learn sed fundamentals.
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@ -41,7 +41,7 @@ sed '
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#+ case where line of code has a comment following it on same line.
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# This is left as a non-trivial exercise.
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# Also, the above code deletes lines with a "*/" or "/*",
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# Also, the above code deletes non-comment lines with a "*/" --
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#+ not a desirable result.
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exit 0
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@ -6,10 +6,13 @@
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TIMELIMIT=4 # 4 seconds
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read -t $TIMELIMIT variable <&1
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# ^^^
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# In this instance, "<&1" is needed for Bash 1.x and 2.x,
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# but unnecessary for Bash 3.x.
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echo
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if [ -z "$variable" ]
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if [ -z "$variable" ] # Is null?
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then
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echo "Timed out, variable still unset."
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else
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@ -17,8 +20,3 @@ else
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fi
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exit 0
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# Exercise for the reader:
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# -----------------------
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# Why is the redirection (<&1) necessary in line 8?
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# What happens if it is omitted?
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@ -12,6 +12,7 @@
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E_BADARGS=65 # Missing command-line arg.
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E_NOHOST=66 # Host not found.
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E_TIMEOUT=67 # Host lookup timed out.
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E_UNDEF=68 # Some other (undefined) error.
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HOSTWAIT=10 # Specify up to 10 seconds for host query reply.
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# The actual wait may be a bit longer.
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OUTFILE=whois.txt # Output file.
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@ -34,6 +35,8 @@ else
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IPADDR="$1" # Command-line arg was IP address.
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fi
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echo; echo "IP Address is: "$IPADDR""; echo
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if [ -e "$OUTFILE" ]
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then
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rm -f "$OUTFILE"
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@ -42,7 +45,15 @@ fi
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# Sanity checks.
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# ==============
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# (This section needs more work.)
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# ===============================
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if [ -z "$IPADDR" ]
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# No response.
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then
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echo "Host not found!"
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exit $E_NOHOST # Bail out.
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fi
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if [[ "$IPADDR" =~ "^[;;]" ]]
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# ;; connection timed out; no servers could be reached
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then
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@ -63,11 +74,11 @@ then
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echo "Host not found!"
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exit $E_NOHOST # Bail out.
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fi
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# ==============
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# ========== Main body of script ==========
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# ======================== Main body of script ========================
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AFRINICquery() {
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# Define the function that queries AFRINIC. Echo a notification to the
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@ -179,9 +190,27 @@ RIPEquery() {
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# * octet2 is the second most significant octet
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slash8=`echo $IPADDR | cut -d. -f 1`
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if [ -z "$slash8" ] # Yet another sanity check.
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then
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echo "Undefined error!"
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exit $E_UNDEF
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fi
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slash16=`echo $IPADDR | cut -d. -f 1-2`
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# ^ Period specified as 'cut" delimiter.
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if [ -z "$slash16" ]
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then
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echo "Undefined error!"
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exit $E_UNDEF
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fi
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octet2=`echo $slash16 | cut -d. -f 2`
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if [ -z "$octet2" ]
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then
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echo "Undefined error!"
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exit $E_UNDEF
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fi
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# Check for various odds and ends of reserved space.
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@ -241,5 +270,7 @@ exit 0
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#@ ABS Guide author comments:
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#@ Nothing fancy here, but still a very useful tool for hunting spammers.
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#@ Sure, the script can be cleaned up a bit (exercise for reader),
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#@+ but still, it's a nice piece of coding by Walter Dnes.
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#@ Sure, the script can be cleaned up some, and it's still a bit buggy,
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#@+ (exercise for reader), but all the same, it's a nice piece of coding
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#@+ by Walter Dnes.
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#@ Thank you!
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|
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Reference in New Issue