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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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| <a name="EXECUTE_005fCOMMAND_005fLINE-_002d_002d_002d-Execute-a-shell-command"></a> |
| <h3 class="section">8.78 <code>EXECUTE_COMMAND_LINE</code> — Execute a shell command</h3> |
| <a name="index-EXECUTE_005fCOMMAND_005fLINE"></a> |
| <a name="index-system_002c-system-call"></a> |
| <a name="index-command-line"></a> |
| |
| <dl compact="compact"> |
| <dt><em>Description</em>:</dt> |
| <dd><p><code>EXECUTE_COMMAND_LINE</code> runs a shell command, synchronously or |
| asynchronously. |
| </p> |
| <p>The <code>COMMAND</code> argument is passed to the shell and executed, using |
| the C library’s <code>system</code> call. (The shell is <code>sh</code> on Unix |
| systems, and <code>cmd.exe</code> on Windows.) If <code>WAIT</code> is present |
| and has the value false, the execution of the command is asynchronous |
| if the system supports it; otherwise, the command is executed |
| synchronously. |
| </p> |
| <p>The three last arguments allow the user to get status information. After |
| synchronous execution, <code>EXITSTAT</code> contains the integer exit code of |
| the command, as returned by <code>system</code>. <code>CMDSTAT</code> is set to zero |
| if the command line was executed (whatever its exit status was). |
| <code>CMDMSG</code> is assigned an error message if an error has occurred. |
| </p> |
| <p>Note that the <code>system</code> function need not be thread-safe. It is |
| the responsibility of the user to ensure that <code>system</code> is not |
| called concurrently. |
| </p> |
| </dd> |
| <dt><em>Standard</em>:</dt> |
| <dd><p>Fortran 2008 and later |
| </p> |
| </dd> |
| <dt><em>Class</em>:</dt> |
| <dd><p>Subroutine |
| </p> |
| </dd> |
| <dt><em>Syntax</em>:</dt> |
| <dd><p><code>CALL EXECUTE_COMMAND_LINE(COMMAND [, WAIT, EXITSTAT, CMDSTAT, CMDMSG ])</code> |
| </p> |
| </dd> |
| <dt><em>Arguments</em>:</dt> |
| <dd><table> |
| <tr><td width="15%"><var>COMMAND</var></td><td width="70%">Shall be a default <code>CHARACTER</code> scalar.</td></tr> |
| <tr><td width="15%"><var>WAIT</var></td><td width="70%">(Optional) Shall be a default <code>LOGICAL</code> scalar.</td></tr> |
| <tr><td width="15%"><var>EXITSTAT</var></td><td width="70%">(Optional) Shall be an <code>INTEGER</code> of the |
| default kind.</td></tr> |
| <tr><td width="15%"><var>CMDSTAT</var></td><td width="70%">(Optional) Shall be an <code>INTEGER</code> of the |
| default kind.</td></tr> |
| <tr><td width="15%"><var>CMDMSG</var></td><td width="70%">(Optional) Shall be an <code>CHARACTER</code> scalar of the |
| default kind.</td></tr> |
| </table> |
| |
| </dd> |
| <dt><em>Example</em>:</dt> |
| <dd><div class="smallexample"> |
| <pre class="smallexample">program test_exec |
| integer :: i |
| |
| call execute_command_line ("external_prog.exe", exitstat=i) |
| print *, "Exit status of external_prog.exe was ", i |
| |
| call execute_command_line ("reindex_files.exe", wait=.false.) |
| print *, "Now reindexing files in the background" |
| |
| end program test_exec |
| </pre></div> |
| |
| |
| </dd> |
| <dt><em>Note</em>:</dt> |
| <dd> |
| <p>Because this intrinsic is implemented in terms of the <code>system</code> |
| function call, its behavior with respect to signaling is processor |
| dependent. In particular, on POSIX-compliant systems, the SIGINT and |
| SIGQUIT signals will be ignored, and the SIGCHLD will be blocked. As |
| such, if the parent process is terminated, the child process might not be |
| terminated alongside. |
| </p> |
| |
| </dd> |
| <dt><em>See also</em>:</dt> |
| <dd><p><a href="SYSTEM.html#SYSTEM">SYSTEM</a> |
| </p></dd> |
| </dl> |
| |
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