119 lines
2.9 KiB
HTML
119 lines
2.9 KiB
HTML
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<title>umask - Get or set the file mode creation mask</title>
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</HEAD>
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<body bgcolor="#FFFFFF">
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<SCRIPT LANGUAGE="Javascript" SRC="../rzahg/synch.js" TYPE="text/javascript"></SCRIPT>
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<h2>umask - Get or set the file mode creation mask</h2>
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<strong>Synopsis</strong>
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<p><strong>umask</strong> [ <strong>-S</strong> ] [ <em>mask</em>
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]</p>
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<p><strong>Description</strong></p>
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<p>You can use <strong>umask</strong> to set or display the file
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creation mask. The mask allows you to control the file permission
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bits that are set when creating a file or directory.</p>
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<p>If you specify <em>mask</em>, <strong>qsh</strong> sets the file
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creation mask to <em>mask</em>. If you do not specify <em>
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mask</em>, <strong>qsh</strong> displays the current file creation
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mask on standard output.</p>
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<p><strong>Options</strong></p>
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<ul>
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<li><strong>-S</strong> Use symbolic permissions.</li>
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</ul>
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<p><strong>Operands</strong></p>
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<p>When using symbolic permissions, <em>mask</em> is an expression
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that defines which permissions should not be removed. A symbolic
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permission is an expression with the format [ <em>who</em> ] <em>
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op</em> [ <em>permission</em> ] where:</p>
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<ul>
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<li><em>who</em> is a combination of the letters:
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<ul>
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<li><strong>u</strong> for owner permissions.</li>
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<li><strong>g</strong> for group permissions</li>
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<li><strong>o</strong> for other (or public) permissions</li>
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<li><strong>a</strong> for all permissions (the default
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value).</li>
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</ul>
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</li>
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<li><em>op</em> is one of the following:
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<ul>
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<li><strong>-</strong> (minus) to delete the permission.</li>
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<li><strong>+</strong> (plus) to add the permission.</li>
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</ul>
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</li>
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<li><em>permission</em> is one or more of the following:
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<ul>
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<li><strong>r</strong> for read permission.</li>
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<li><strong>w</strong> for write permission.</li>
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<li><strong>x</strong> for execute or search permission.</li>
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</ul>
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</li>
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</ul>
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<p><strong>Exit Status</strong></p>
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<ul>
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<li>0 when successful.</li>
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<li>>0 when <em>mask</em> is invalid.</li>
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</ul>
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<p><strong>Related information</strong></p>
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<ul>
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<li><a href="chmod.htm">chmod - Change file modes
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(permissions)</a></li>
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<li><a href="touch.htm">touch - Change file access and modification
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times</a></li>
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</ul>
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<strong>Examples</strong>
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<ol>
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<li>Display the current file creation mask in symbolic form:
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<strong>umask -S</strong></li>
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<li>Display the current file creation mask: <strong>
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umask</strong></li>
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<li>Set the file creation mask to remove read permission for
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others: <strong>umask</strong> 004</li>
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<li>Set the file creation mask to remove write permission for
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group: <strong>umask -S</strong> g-w</li>
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</ol>
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</body>
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</html>
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