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<title>The GNU Fortran Compiler: EXECUTE_COMMAND_LINE</title>
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<a name="EXECUTE_005fCOMMAND_005fLINE"></a>
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<div class="header">
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<p>
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Next: <a href="EXIT.html#EXIT" accesskey="n" rel="next">EXIT</a>, Previous: <a href="EVENT_005fQUERY.html#EVENT_005fQUERY" accesskey="p" rel="prev">EVENT_QUERY</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="EXECUTE_005fCOMMAND_005fLINE-_002d_002d_002d-Execute-a-shell-command"></a>
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<h3 class="section">9.93 <code>EXECUTE_COMMAND_LINE</code> — Execute a shell command</h3>
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<a name="index-EXECUTE_005fCOMMAND_005fLINE"></a>
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<a name="index-system_002c-system-call"></a>
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<a name="index-command-line"></a>
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<dl compact="compact">
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<dt><em>Description</em>:</dt>
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<dd><p><code>EXECUTE_COMMAND_LINE</code> runs a shell command, synchronously or
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asynchronously.
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</p>
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<p>The <code>COMMAND</code> argument is passed to the shell and executed, using
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the C library’s <code>system</code> call. (The shell is <code>sh</code> on Unix
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systems, and <code>cmd.exe</code> on Windows.) If <code>WAIT</code> is present
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and has the value false, the execution of the command is asynchronous
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if the system supports it; otherwise, the command is executed
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synchronously.
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</p>
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<p>The three last arguments allow the user to get status information. After
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synchronous execution, <code>EXITSTAT</code> contains the integer exit code of
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the command, as returned by <code>system</code>. <code>CMDSTAT</code> is set to zero
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if the command line was executed (whatever its exit status was).
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<code>CMDMSG</code> is assigned an error message if an error has occurred.
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</p>
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<p>Note that the <code>system</code> function need not be thread-safe. It is
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the responsibility of the user to ensure that <code>system</code> is not
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called concurrently.
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</p>
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</dd>
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<dt><em>Standard</em>:</dt>
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<dd><p>Fortran 2008 and later
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</p>
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</dd>
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<dt><em>Class</em>:</dt>
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<dd><p>Subroutine
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</p>
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</dd>
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<dt><em>Syntax</em>:</dt>
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<dd><p><code>CALL EXECUTE_COMMAND_LINE(COMMAND [, WAIT, EXITSTAT, CMDSTAT, CMDMSG ])</code>
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</p>
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</dd>
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<dt><em>Arguments</em>:</dt>
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<dd><table>
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<tr><td width="15%"><var>COMMAND</var></td><td width="70%">Shall be a default <code>CHARACTER</code> scalar.</td></tr>
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<tr><td width="15%"><var>WAIT</var></td><td width="70%">(Optional) Shall be a default <code>LOGICAL</code> scalar.</td></tr>
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<tr><td width="15%"><var>EXITSTAT</var></td><td width="70%">(Optional) Shall be an <code>INTEGER</code> of the
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default kind.</td></tr>
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<tr><td width="15%"><var>CMDSTAT</var></td><td width="70%">(Optional) Shall be an <code>INTEGER</code> of the
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default kind.</td></tr>
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<tr><td width="15%"><var>CMDMSG</var></td><td width="70%">(Optional) Shall be an <code>CHARACTER</code> scalar of the
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default kind.</td></tr>
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</table>
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</dd>
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<dt><em>Example</em>:</dt>
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<dd><div class="smallexample">
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<pre class="smallexample">program test_exec
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integer :: i
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call execute_command_line ("external_prog.exe", exitstat=i)
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print *, "Exit status of external_prog.exe was ", i
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call execute_command_line ("reindex_files.exe", wait=.false.)
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print *, "Now reindexing files in the background"
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end program test_exec
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</pre></div>
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</dd>
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<dt><em>Note</em>:</dt>
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<dd>
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<p>Because this intrinsic is implemented in terms of the <code>system</code>
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function call, its behavior with respect to signaling is processor
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dependent. In particular, on POSIX-compliant systems, the SIGINT and
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SIGQUIT signals will be ignored, and the SIGCHLD will be blocked. As
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such, if the parent process is terminated, the child process might not be
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terminated alongside.
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</p>
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</dd>
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<dt><em>See also</em>:</dt>
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<dd><p><a href="SYSTEM.html#SYSTEM">SYSTEM</a>
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</p></dd>
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</dl>
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Next: <a href="EXIT.html#EXIT" accesskey="n" rel="next">EXIT</a>, Previous: <a href="EVENT_005fQUERY.html#EVENT_005fQUERY" accesskey="p" rel="prev">EVENT_QUERY</a>, Up: <a href="Intrinsic-Procedures.html#Intrinsic-Procedures" accesskey="u" rel="up">Intrinsic Procedures</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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