310 lines
5.1 KiB
HTML
310 lines
5.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
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<HTML
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><HEAD
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><TITLE
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>Exercises</TITLE
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><META
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NAME="GENERATOR"
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CONTENT="Modular DocBook HTML Stylesheet Version 1.7"><LINK
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REL="HOME"
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TITLE="Bash Guide for Beginners"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="The GNU awk programming language"
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HREF="chap_06.html"><LINK
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REL="PREVIOUS"
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TITLE="Summary"
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HREF="sect_06_04.html"><LINK
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REL="NEXT"
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TITLE="Conditional statements"
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HREF="chap_07.html"></HEAD
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><BODY
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CLASS="sect1"
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BGCOLOR="#FFFFFF"
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TEXT="#000000"
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LINK="#0000FF"
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VLINK="#840084"
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ALINK="#0000FF"
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><DIV
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CLASS="NAVHEADER"
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><TABLE
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SUMMARY="Header navigation table"
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WIDTH="100%"
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BORDER="0"
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TH
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COLSPAN="3"
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ALIGN="center"
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>Bash Guide for Beginners</TH
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></TR
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><TR
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><TD
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WIDTH="10%"
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ALIGN="left"
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VALIGN="bottom"
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><A
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HREF="sect_06_04.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="80%"
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ALIGN="center"
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VALIGN="bottom"
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>Chapter 6. The GNU awk programming language</TD
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><TD
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WIDTH="10%"
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ALIGN="right"
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VALIGN="bottom"
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><A
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HREF="chap_07.html"
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ACCESSKEY="N"
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>Next</A
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></TD
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></TR
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></TABLE
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><HR
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ALIGN="LEFT"
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WIDTH="100%"></DIV
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><DIV
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CLASS="sect1"
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><H1
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CLASS="sect1"
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><A
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NAME="sect_06_05"
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></A
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>6.5. Exercises</H1
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><P
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>These are some practical examples where <B
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CLASS="command"
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>awk</B
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> can be useful.</P
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><P
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></P
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><OL
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TYPE="1"
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><LI
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><P
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>For the first exercise, your input is lines in the following form:</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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>Username:Firstname:Lastname:Telephone number</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>Make an <B
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CLASS="command"
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>awk</B
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> script that will convert such a line to an LDAP record in this format:</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> dn: uid=Username, dc=example, dc=com
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cn: Firstname Lastname
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sn: Lastname
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telephoneNumber: Telephone number
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>Create a file containing a couple of test records and check.</P
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></LI
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><LI
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><P
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>Create a Bash script using <B
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CLASS="command"
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>awk</B
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> and standard UNIX commands that will show the top three users of disk space in the <TT
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CLASS="filename"
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>/home</TT
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> file system (if you don't have the directory holding the homes on a separate partition, make the script for the <TT
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CLASS="filename"
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>/</TT
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> partition; this is present on every UNIX system). First, execute the commands from the command line. Then put them in a script. The script should create sensible output (sensible as in readable by the boss). If everything proves to work, have the script email its results to you (use for instance <B
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CLASS="command"
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>mail <TT
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CLASS="option"
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>-s</TT
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> <TT
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CLASS="parameter"
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><I
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>Disk space usage</I
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></TT
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> <TT
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CLASS="email"
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><<A
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HREF="mailto:you@your_comp"
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>you@your_comp</A
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>></TT
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> < <TT
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CLASS="filename"
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>result</TT
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></B
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>).</P
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><P
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>If the quota daemon is running, use that information; if not, use <B
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CLASS="command"
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>find</B
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>.</P
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></LI
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><LI
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><P
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>Create XML-style output from a <B
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CLASS="keycap"
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>Tab</B
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>-separated list in the following form:</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> Meaning very long line with a lot of description
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meaning another long line
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othermeaning more longline
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testmeaning looooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong line, but i mean really looooooooooooooooooooooooooooooooooooooooooooooooooong.
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>The output should read:</P
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><TABLE
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BORDER="0"
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BGCOLOR="#E0E0E0"
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WIDTH="100%"
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><TR
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><TD
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><FONT
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COLOR="#000000"
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><PRE
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CLASS="screen"
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> <row>
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<entry>Meaning</entry>
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<entry>
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very long line
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</entry>
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</row>
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<row>
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<entry>meaning</entry>
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<entry>
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long line
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</entry>
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</row>
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<row>
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<entryothermeaning</entry>
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<entry>
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more longline
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</entry>
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</row>
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<row>
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<entrytestmeaning</entry>
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<entry>
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looooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong line, but i mean really looooooooooooooooooooooooooooooooooooooooooooooooooong.
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</entry>
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</row>
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</PRE
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></FONT
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></TD
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></TR
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></TABLE
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><P
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>Additionally, if you know anything about XML, write a BEGIN and END script to complete the table. Or do it in HTML.</P
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></LI
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></OL
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></DIV
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><DIV
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CLASS="NAVFOOTER"
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><HR
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ALIGN="LEFT"
|
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WIDTH="100%"><TABLE
|
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SUMMARY="Footer navigation table"
|
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WIDTH="100%"
|
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BORDER="0"
|
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CELLPADDING="0"
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CELLSPACING="0"
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><TR
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><TD
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WIDTH="33%"
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ALIGN="left"
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VALIGN="top"
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><A
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HREF="sect_06_04.html"
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ACCESSKEY="P"
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>Prev</A
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></TD
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><TD
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WIDTH="34%"
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ALIGN="center"
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VALIGN="top"
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><A
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HREF="index.html"
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ACCESSKEY="H"
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>Home</A
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></TD
|
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><TD
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WIDTH="33%"
|
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ALIGN="right"
|
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VALIGN="top"
|
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><A
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HREF="chap_07.html"
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ACCESSKEY="N"
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>Next</A
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></TD
|
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></TR
|
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><TR
|
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><TD
|
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WIDTH="33%"
|
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ALIGN="left"
|
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VALIGN="top"
|
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>Summary</TD
|
|
><TD
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WIDTH="34%"
|
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ALIGN="center"
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VALIGN="top"
|
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><A
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HREF="chap_06.html"
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ACCESSKEY="U"
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>Up</A
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></TD
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><TD
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WIDTH="33%"
|
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ALIGN="right"
|
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VALIGN="top"
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>Conditional statements</TD
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></TR
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></TABLE
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></DIV
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></BODY
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></HTML
|
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> |