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\section else else - execute command if a condition is not met.
\subsection else-synopsis Synopsis
<tt>if CONDITION; COMMAND_TRUE [else; COMMAND_FALSE] end;</tt>
\subsection else-description Description
<tt>if</tt> will execute the command CONDITION. If the commands exit
status is zero, the command COMMAND_TRUE will execute. If it is
not zero and COMMAND_FALSE is specified, COMMAND_FALSE will be
executed.
\subsection else-example Example
The command <tt>if test -f foo.txt; echo foo.txt exists; else; echo foo.txt does not exist; end</tt>
will print <tt>foo.txt exists</tt> if the file foo.txt
exists and is a regular file, otherwise it will print
<tt>foo.txt does not exist</tt>.
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