225 lines
3.4 KiB
HTML
225 lines
3.4 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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>Testing Your Knowledge of Tests</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="Advanced Bash-Scripting Guide"
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HREF="index.html"><LINK
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REL="UP"
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TITLE="Tests"
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HREF="tests.html"><LINK
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REL="PREVIOUS"
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TITLE="Nested if/then Condition Tests"
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HREF="nestedifthen.html"><LINK
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REL="NEXT"
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TITLE="Operations and Related Topics"
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HREF="operations.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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SUMMARY="Header navigation table"
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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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>Advanced Bash-Scripting Guide: </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="nestedifthen.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 7. Tests</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="operations.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="TESTTEST"
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></A
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>7.5. Testing Your Knowledge of Tests</H1
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><P
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>The systemwide <TT
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CLASS="FILENAME"
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>xinitrc</TT
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> file can be used
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to launch the X server. This file contains quite a number
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of <I
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CLASS="FIRSTTERM"
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>if/then</I
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> tests. The following
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is excerpted from an <SPAN
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CLASS="QUOTE"
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>"ancient"</SPAN
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> version of
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<TT
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CLASS="FILENAME"
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>xinitrc</TT
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> (<I
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CLASS="FIRSTTERM"
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>Red Hat 7.1</I
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>,
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or thereabouts).</P
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><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="PROGRAMLISTING"
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>if [ -f $HOME/.Xclients ]; then
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exec $HOME/.Xclients
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elif [ -f /etc/X11/xinit/Xclients ]; then
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exec /etc/X11/xinit/Xclients
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else
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# failsafe settings. Although we should never get here
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# (we provide fallbacks in Xclients as well) it can't hurt.
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xclock -geometry 100x100-5+5 &
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xterm -geometry 80x50-50+150 &
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if [ -f /usr/bin/netscape -a -f /usr/share/doc/HTML/index.html ]; then
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netscape /usr/share/doc/HTML/index.html &
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fi
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fi</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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><P
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>Explain the <I
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CLASS="FIRSTTERM"
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>test</I
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> constructs in the
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above snippet, then examine an updated version of the
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file, <TT
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CLASS="FILENAME"
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>/etc/X11/xinit/xinitrc</TT
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>, and
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analyze the <I
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CLASS="FIRSTTERM"
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>if/then</I
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> test constructs
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there. You may need to refer ahead to the discussions of <A
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HREF="textproc.html#GREPREF"
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>grep</A
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>, <A
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HREF="sedawk.html#SEDREF"
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>sed</A
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>,
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and <A
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HREF="regexp.html#REGEXREF"
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>regular expressions</A
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>.</P
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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="nestedifthen.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="operations.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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>Nested <TT
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CLASS="REPLACEABLE"
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><I
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>if/then</I
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></TT
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> Condition Tests</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="tests.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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>Operations and Related Topics</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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> |