2005-09-20 21:31:55 +08:00
|
|
|
|
|
|
|
\section or or - Conditionally execute a command
|
|
|
|
|
|
|
|
\subsection or-synopsis Synopsis
|
2006-01-05 23:37:53 +08:00
|
|
|
<tt>COMMAND1; or COMMAND2</tt>
|
2005-09-20 21:31:55 +08:00
|
|
|
|
|
|
|
\subsection or-description Description
|
|
|
|
|
2006-01-05 23:37:53 +08:00
|
|
|
The \c or builtin is used to execute a command if the current exit status (as set by the last previous command) is non-zero
|
2005-09-20 21:31:55 +08:00
|
|
|
|
2006-06-04 07:15:17 +08:00
|
|
|
The or command does not change the current exit status.
|
|
|
|
|
2005-09-20 21:31:55 +08:00
|
|
|
\subsection or-example Example
|
|
|
|
|
2006-06-04 07:15:17 +08:00
|
|
|
The following code runs the \c make command to build a program, if the
|
|
|
|
build succceds, the program is installed. If either step fails,
|
|
|
|
<tt>make clean</tt> is run, which removes the files created by the
|
|
|
|
build process
|
|
|
|
|
2005-09-20 21:31:55 +08:00
|
|
|
<pre>
|
2006-06-04 07:15:17 +08:00
|
|
|
make; and make install; or make clean
|
2005-09-20 21:31:55 +08:00
|
|
|
</pre>
|
|
|
|
|