updated

LDP/guide/docbook/abs-guide/Change.log

@@ -2,6 +2,88 @@ RELEASE HISTORY
 ------- -------
 Change log
 
+Version 1.0.X interim release
+
+1) Fix up comments in "weirdvars.sh" example.
+
+2) In "Variables" chapter, slight wording change in first paragraph.
+
+3) Slight changes to "ex9.sh" example.
+
+4) Added redirection as an alternative remedy to the script hang problem with
+   background commands in "Job Control Commands" section of "Internal
+   Commands" chapter.
+
+5) In "Text Processing Commands" section of "External Commands" chapter:
+      Added "-q" option at "grep", with in-line example.
+      Added usage example for "cut".
+      Much more information on "uniq -c", and added "wf.sh" example.
+
+6) In "Functions" chapter:
+     Added more info on oversize (> 256) return values.   
+     Modified "ex62.sh" example.
+     Reorganized "Local Variables" section.
+     Added note that before function call, all variables within functions
+     are local, not just those explicitly declared as such.
+
+7) Add section on "Shell Scripting Under Windows" to "Miscellany" chapter.
+
+8) In "String Manipulation" section of "Variables Revisited" chapter:
+      Bugfix in comment in "%%" substring removal example.
+      Added "cvt.sh" example at "%%" substring removal discussion.
+      Added subsection on using "awk" functionality for string manipulation,
+      with added "substring-extraction.sh" example.
+
+9) In "$RANDOM" section of "Variables Revisited" chapter:
+      Removed superfluous "note" icon at beginning of section.
+      Added example of using "awk" rand() function to generate random numbers.
+
+10) In "Command Substitution" chapter:
+      Added discussion and example of extending Bash toolset.
+      Added footnote about what exactly constitutes a "command".
+
+11) In "System and Administrative Commands" chapter:
+    Added "lastlog" command.   
+    More info on "route" and "netstat".
+    Fixed reference to "crond" at "logrotate".
+    Added "tmpwatch".
+    Added "sar".
+
+12) In "Miscellaneous Commands" section of "External Commands" chapter,
+    added more info and an example to "dd".
+
+13) In "Math Commands" section of "External Commands" chapter:
+    Added an alternative method of invoking 'bc', with "alt-bc.sh" example.
+    Added using "awk" math commands, with "hypotenuse.sh" example.
+
+14) In "Archiving Commands" section of "External Commands" chapter,
+    added footnote to "tar".
+
+15) In "Bibliography" section:
+      Cleaned up cross reference to University of Alberta site.
+      Added comp.unix.shell newsgroup reference.
+
+16) Made corrections to "symlinks.sh" and "symlinks2.sh" examples,
+    per Dominik 'Aeneas' Schnitzer.
+
+17) In "Starting Off With a Sha-Bang" chapter, clarified footnote explaining
+   "magic numbers", per Stanislav Brabec's suggestion.
+
+18) In "I/O Redirection" chapter, added stdout redirection instance, with
+    example.
+
+19) In "Sed and Awk Micro-Primer" appendix:
+    Added $filename to in-line examples.
+    Fixup on "END" command block description.
+
+20) Added semicolons as necessary to terminate commands in Perl examples.    
+
+21) Added "History Commands" appendix. 
+
+
+
+
+
 Version 1.0 (stable!), released 10/14/01
 
 1) Quoted "$LOGFILE" in in-line example in "Scripting With Style" subsection

LDP/guide/docbook/abs-guide/ex56.sh

@@ -4,7 +4,7 @@
 echo "This precedes the embedded Perl script within \"$0\"."
 echo "==============================================================="
 
-perl -e 'print "This is an embedded Perl script\n"'
+perl -e 'print "This is an embedded Perl script.\n";'
 # Like sed, Perl also uses the "-e" option.
 
 echo "==============================================================="

LDP/guide/docbook/abs-guide/ex62.sh

@@ -2,17 +2,24 @@
 
 func ()
 {
-  local a=23
-  echo
-  echo "a in function = $a"
+  local loc_var=23       # Declared local.
   echo
+  echo "\"loc_var\" in function = $loc_var"
+  global_var=999         # Not declared local.
+  echo "\"global_var\" in function = $global_var"
 }  
 
 func
 
 # Now, see if local 'a' exists outside function.
 
-echo "a outside function = $a"  # Nope, 'a' not visible globally.
 echo
+echo "\"loc_var\" outside function = $loc_var"
+                                      # "loc_var" outside function = 
+                                      # Nope, $loc_var not visible globally.
+echo "\"global_var\" outside function = $global_var"
+                                      # "global_var" outside function = 999
+                                      # $global_var is visible globally.
+echo				      
 
 exit 0

LDP/guide/docbook/abs-guide/ex9.sh

@@ -25,9 +25,15 @@ echo ${hello} #Identical to above.
 echo "$hello"
 echo "${hello}"
 
-# hello="A B  C   D"
+echo
+
+hello="A B  C   D"
+echo $hello
+echo "$hello"
 # Now,   echo $hello   and   echo "$hello"   give different results.
-# Quoting variable preserves whitespace.
+# Quoting a variable preserves whitespace.
+
+echo
 
 echo '$hello'
 #  Variable referencing disabled by single quotes,

LDP/guide/docbook/abs-guide/symlinks.sh

@@ -12,10 +12,10 @@ fi
 
 echo "symbolic links in directory \"$directory\""
 
-for file in $( find $directory -type l )   # -type l = symbolic links
+for file in "$( find $directory -type l )"   # -type l = symbolic links
 do
   echo "$file"
-done | sort                                # Otherwise file list is unsorted.
+done | sort                                  # Otherwise file list is unsorted.
 
 #  As Dominik 'Aeneas' Schnitzer points out,
 #+ failing to quote  $( find $directory -type l )

LDP/guide/docbook/abs-guide/symlinks2.sh

@@ -13,10 +13,10 @@ fi
 
 echo "symbolic links in directory \"$directory\""
 
-for file in $( find $directory -type l )   # -type l = symbolic links
+for file in "$( find $directory -type l )"   # -type l = symbolic links
 do
   echo "$file"
-done | sort > "$OUTFILE"                   # stdout of loop
-#           ^^^^^^^^^^^^                     redirected to save file.
+done | sort > "$OUTFILE"                     # stdout of loop
+#           ^^^^^^^^^^^^                       redirected to save file.
 
 exit 0

LDP/guide/docbook/abs-guide/weirdvars.sh

@@ -5,9 +5,11 @@ var="'(]\\{}\$\""
 echo $var        # '(]\{}$"
 echo "$var"      # '(]\{}$"     Doesn't make a difference.
 
+echo
+
 IFS='\'
-echo $var        # '(]\{}$"     \ converted to space.
-echo "$var"      # '(] {}$"
+echo $var        # '(] {}$"     \ converted to space.
+echo "$var"      # '(]\{}$"
 
 # Examples above supplied by S.C.