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>7.5. Testing Your Knowledge of Tests</H1
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>The systemwide <TT
CLASS="FILENAME"
>xinitrc</TT
> file can be used
to launch the X server. This file contains quite a number
of <I
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>if/then</I
> tests. The following
is excerpted from an <SPAN
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or thereabouts).</P
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> 1 if [ -f $HOME/.Xclients ]; then
2 exec $HOME/.Xclients
3 elif [ -f /etc/X11/xinit/Xclients ]; then
4 exec /etc/X11/xinit/Xclients
5 else
6 # failsafe settings. Although we should never get here
7 # (we provide fallbacks in Xclients as well) it can't hurt.
8 xclock -geometry 100x100-5+5 &
9 xterm -geometry 80x50-50+150 &
10 if [ -f /usr/bin/netscape -a -f /usr/share/doc/HTML/index.html ]; then
11 netscape /usr/share/doc/HTML/index.html &
12 fi
13 fi</PRE
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>Explain the <I
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>test</I
> constructs in the
above snippet, then examine an updated version of the
file, <TT
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>/etc/X11/xinit/xinitrc</TT
>, and
analyze the <I
CLASS="FIRSTTERM"
>if/then</I
> test constructs
there. You may need to refer ahead to the discussions of <A
HREF="textproc.html#GREPREF"
>grep</A
>, <A
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>sed</A
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and <A
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>regular expressions</A
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