<html lang="en"> <head> <title>GET_COMMAND_ARGUMENT - The GNU Fortran Compiler</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="The GNU Fortran Compiler"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="Intrinsic-Procedures.html#Intrinsic-Procedures" title="Intrinsic Procedures"> <link rel="prev" href="GET_005fCOMMAND.html#GET_005fCOMMAND" title="GET_COMMAND"> <link rel="next" href="GETCWD.html#GETCWD" title="GETCWD"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc. 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Copies published by the Free Software Foundation raise funds for GNU development.--> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="GET_COMMAND_ARGUMENT"></a> <a name="GET_005fCOMMAND_005fARGUMENT"></a> <p> Next: <a rel="next" accesskey="n" href="GETCWD.html#GETCWD">GETCWD</a>, Previous: <a rel="previous" accesskey="p" href="GET_005fCOMMAND.html#GET_005fCOMMAND">GET_COMMAND</a>, Up: <a rel="up" accesskey="u" href="Intrinsic-Procedures.html#Intrinsic-Procedures">Intrinsic Procedures</a> <hr> </div> <h3 class="section">8.97 <code>GET_COMMAND_ARGUMENT</code> — Get command line arguments</h3> <p><a name="index-GET_005fCOMMAND_005fARGUMENT-650"></a><a name="index-command_002dline-arguments-651"></a><a name="index-arguments_002c-to-program-652"></a> <dl> <dt><em>Description</em>:<dd>Retrieve the <var>NUMBER</var>-th argument that was passed on the command line when the containing program was invoked. <br><dt><em>Standard</em>:<dd>Fortran 2003 and later <br><dt><em>Class</em>:<dd>Subroutine <br><dt><em>Syntax</em>:<dd><code>CALL GET_COMMAND_ARGUMENT(NUMBER [, VALUE, LENGTH, STATUS])</code> <br><dt><em>Arguments</em>:<dd> <p><table summary=""><tr align="left"><td valign="top" width="15%"><var>NUMBER</var> </td><td valign="top" width="70%">Shall be a scalar of type <code>INTEGER</code> and of default kind, <var>NUMBER</var> \geq 0 <br></td></tr><tr align="left"><td valign="top" width="15%"><var>VALUE</var> </td><td valign="top" width="70%">(Optional) Shall be a scalar of type <code>CHARACTER</code> and of default kind. <br></td></tr><tr align="left"><td valign="top" width="15%"><var>LENGTH</var> </td><td valign="top" width="70%">(Optional) Shall be a scalar of type <code>INTEGER</code> and of default kind. <br></td></tr><tr align="left"><td valign="top" width="15%"><var>STATUS</var> </td><td valign="top" width="70%">(Optional) Shall be a scalar of type <code>INTEGER</code> and of default kind. <br></td></tr></table> <br><dt><em>Return value</em>:<dd>After <code>GET_COMMAND_ARGUMENT</code> returns, the <var>VALUE</var> argument holds the <var>NUMBER</var>-th command line argument. If <var>VALUE</var> can not hold the argument, it is truncated to fit the length of <var>VALUE</var>. If there are less than <var>NUMBER</var> arguments specified at the command line, <var>VALUE</var> will be filled with blanks. If <var>NUMBER</var> = 0, <var>VALUE</var> is set to the name of the program (on systems that support this feature). The <var>LENGTH</var> argument contains the length of the <var>NUMBER</var>-th command line argument. If the argument retrieval fails, <var>STATUS</var> is a positive number; if <var>VALUE</var> contains a truncated command line argument, <var>STATUS</var> is -1; and otherwise the <var>STATUS</var> is zero. <br><dt><em>Example</em>:<dd> <pre class="smallexample"> PROGRAM test_get_command_argument INTEGER :: i CHARACTER(len=32) :: arg i = 0 DO CALL get_command_argument(i, arg) IF (LEN_TRIM(arg) == 0) EXIT WRITE (*,*) TRIM(arg) i = i+1 END DO END PROGRAM </pre> <br><dt><em>See also</em>:<dd><a href="GET_005fCOMMAND.html#GET_005fCOMMAND">GET_COMMAND</a>, <a href="COMMAND_005fARGUMENT_005fCOUNT.html#COMMAND_005fARGUMENT_005fCOUNT">COMMAND_ARGUMENT_COUNT</a> </dl> </body></html>