137 lines
4.4 KiB
HTML
137 lines
4.4 KiB
HTML
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<title>declare - Declare variables and set attributes</title>
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<SCRIPT LANGUAGE="Javascript" SRC="../rzahg/synch.js" TYPE="text/javascript"></SCRIPT>
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<p>
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<h2>declare - Declare variables and set attributes</h2>
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<strong>Synopsis</strong>
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</p>
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<p><strong>declare [ -Eilrux ]</strong> <em>name</em> <strong>[</strong><em>=value</em><strong>]</strong> ...</p>
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<p><strong>declare [ +Eilrux ]</strong> <em>name</em> <strong>[</strong><em>=value</em><strong>]</strong> ...</p>
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<p><strong>declare -fF [</strong> <em>name ...</em> <strong>]</strong></p>
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<p><strong>declare -p </strong> <em>name ...</em></p>
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<p><strong>declare</strong></p>
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<p><strong>Description</strong></p>
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<p>The <strong>declare</strong> utility declares variables, assigns values to variables,
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sets or unsets attributes for variables, and displays the definitions for
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<a href="cmpdcmds.htm#functions">shell functions</a>. If used in a shell function,
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<strong>declare</strong> makes the variable <em>name</em> local to the function.
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</p>
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<p>In the first synopsis form, <strong>declare</strong> declares a variable <em>name</em>
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and optionally assigns it the specified <em>value</em>. If an option is specified,
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the corresponding attribute is turned on for the variable.</p>
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<p>In the second synopsis form, <strong>declare</strong> declares a variable <em>name</em>
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and optionally assigns it the specified <em>value</em>. If an option is specified,
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the corresponding attribute is turned off for the variable.</p>
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<p>In the third synopsis form, <strong>declare</strong> displays the names and definitions
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for all shell functions if no <em>names</em> are specified or the shell functions specified
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by <em>name</em>.</p>
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<p>In the fourth synopsis form, <strong>declare</strong> displays the attributes and value
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of the variables specified by <em>name</em> in a re-enterable format.</p>
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<p>In the fifth synopsis form, <strong>declare</strong> displays the names and values
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of all variables.</p>
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<p><strong>Options</strong></p>
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<dl>
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<dt><strong>-E</strong></dt>
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<dd>Set the floating point attribute for the variable. On assignments to the
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variable the value is evaluated as a floating point number.</dd>
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<dt><strong>-f</strong></dt>
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<dd>Display the names and definitions of shell functions.</dd>
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<dt><strong>-F</strong></dt>
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<dd>Display the names of shell functions.</dd>
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<dt><strong>-i</strong></dt>
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<dd>Set the integer attribute for the variable. On assignments to the
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variable the value is evaluated as an integer number.</dd>
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<dt><strong>-l</strong></dt>
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<dd>Set the lowercase attribute for the variable. On assignments to the
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variable the value is set to lowercase characters.</dd>
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<dt><strong>-p</strong></dt>
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<dd>Display each variable in a re-enterable format.</dd>
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<dt><strong>-r</strong></dt>
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<dd>Set the read-only attribute for the variable. The variable cannot have its value
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changed by a subsequent assignment and cannot be unset. If a <em>value</em>
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is also specified, the value of the variable is updated before setting
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the read-only attribute.</dd>
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<dt><strong>-u</strong></dt>
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<dd>Set the uppercase attribute for the variable. On assignments to the
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variable the value is set to uppercase characters.</dd>
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<dt><strong>-x</strong></dt>
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<dd>Set the export attribute for the variable. The variable is automatically placed
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in the environment of subsequently executed commands.</dd>
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</dl>
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<p><strong>Operands</strong></p>
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<p>Each <em>name</em> must be a valid <a href="variable.htm">shell variable</a> name.</p>
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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 unsuccessful</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="export.htm">export - Set export attribute for
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variables</a></li>
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<li><a href="let.htm">let - Evaluate arithmetic expression</a></li>
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<li><a href="local.htm">local - Assign a local variable in a
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function</a></li>
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<li><a href="readonly.htm">readonly - Set read-only attribute for variables</a></li>
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<li><a href="set.htm">set - Set or unset options and positional
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parameters</a></li>
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<li><a href="unset.htm">unset - Unset values of variables and
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functions</a></li>
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</ul>
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</body>
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