\section or or - Conditionally execute a command

\subsection or-synopsis Synopsis
 <tt>or COMMAND1; COMMAND2</tt>

\subsection or-description Description

The \c or builtin is used to execute one command, and if it returns
non-zero status, also execute a second command. 

\subsection or-example Example

The following code runs the \c make command to build a program, or if it fails, it runs <tt>make clean</tt>, which removes the files created by the build process
<pre>
or make; make clean
</pre>

\c or and \c and can be nested, as in this example, that attempts to build and install a program, and removed the files created by the build process on failiure

<pre>
or and make; make install; make clean
</pre>