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copied!<p>The command you specify to <code>at</code> is executed by <code>/bin/sh</code>, but sh can invoke any command, executed directly or by any specified interpreter.</p> <p>The following works on my Ubuntu 12.04 system with the bash shell:</p> <pre><code>$ cat hello.php #!/usr/bin/php <?php echo "Hello, PHP\n"; ?> $ echo "$PWD/hello.php > hello.php.out" | at 16:11 warning: commands will be executed using /bin/sh job 4 at Sat Aug 25 16:11:00 2012 $ date Sat Aug 25 16:11:05 PDT 2012 $ cat hello.php.out Hello, PHP $ </code></pre> <p>In some cases, you'll have to do some extra work to set environment variables correctly (it's not necessary for this simple case). Quoting the man page:</p> <blockquote> <p>For both <strong>at</strong> and <strong>batch</strong>, commands are read from standard input or the file specified with the <strong>-f</strong> option and executed. The working directory, the environment (except for the variables <strong>BASH_VERSINFO</strong>, <strong>DISPLAY</strong>, <strong>EUID</strong>, <strong>GROUPS</strong>, <strong>SHELLOPTS</strong>, <strong>TERM</strong>, <strong>UID</strong>, and <strong>_</strong>) and the umask are retained from the time of invocation.</p> <p>As <strong>at</strong> is currently implemented as a setuid program, other environment variables (e.g. <strong>LD_LIBRARY_PATH</strong> or <strong>LD_PRELOAD</strong>) are also not exported. This may change in the future. As a workaround, set these variables explicitly in your job.</p> </blockquote>

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