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<title>execline: the umask command</title>
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<h1> The <tt>umask</tt> program </h1>
<p>
<tt>umask</tt> changes its file mode creation mask, then executes a program.
Alternatively, it can print the current mask.
</p>
<h2> Interface </h2>
<pre>
umask [ -S ] [ <em>mask</em> ] [ <em>prog...</em> ]
</pre>
<p>
When called with no argument, <tt>umask</tt> prints the value of the
file mode creation mask of the invoking process, then exits 0.
</p>
<p>
When called with a <em>mask</em> argument, <tt>umask</tt> changes
its file mode creation mask; then, if <em>prog...</em> is not empty, it execs
into it.
</p>
<p>
<tt>umask</tt> interprets <em>mask</em> as specified by the
<a href="https://pubs.opengroup.org/onlinepubs/9799919799/utilities/umask.html">POSIX
specification for a <tt>umask</tt> external utility</a>.
</p>
<h2> Notes </h2>
<ul>
<li> <tt>umask</tt> fully conforms to the
<a href="https://pubs.opengroup.org/onlinepubs/9799919799/utilities/umask.html">POSIX
specification</a>. When <em>prog...</em> is not empty, the behaviour of a
<tt>umask</tt> utility is not specified by POSIX, so <tt>umask</tt> extends
the spec to be actually useful and usable in an execline program. </li>
</ul>
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