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    <p>As question title stand for <code>system</code> command, this will answer directly, but the sample command using bash contain only thing that will be simplier in perl only (take a look at other answer using <code>opendir</code> and <code>-d</code> in perl).</p> <p>If you want to use <code>system</code> (instead of <code>open $cmdHandle,"bash -c ... |"</code>), the prefered syntax for execution commands like <code>system</code> or <code>exec</code>, is to let <code>perl</code> parsing the command line.</p> <p>Try this (as you've already done):</p> <pre><code>perl -e 'system("bash -c \"echo hello world\"")' hello world perl -e 'system "bash -c \"echo hello world\"";' hello world </code></pre> <p>And now better, same but letting <code>perl</code> ensure command line parsing, try this:</p> <pre><code>perl -e 'system "bash","-c","echo hello world";' hello world </code></pre> <p>There are clearly 3 argument of <code>system</code> command:</p> <ol> <li>bash</li> <li>-c</li> <li>the script</li> </ol> <p>or little more:</p> <pre><code>perl -e 'system "bash","-c","echo hello world;date +\"Now it is %T\";";' hello world Now it is 11:43:44 </code></pre> <p>as you can see in last purpose, there is no double <em>double-quotes</em> enclosing <em>bash script</em> part of command line.</p> <p>**Nota: on command line, using <code>perl -e '...'</code> or <code>perl -e "..."</code>, it's a little heavy to play with quotes and double-quotes. In a script, you could mix them:</p> <pre><code>system 'bash','-c','for ((i=10;i--;));do printf "Number: %2d\n" $i;done'; </code></pre> <p>or even:</p> <pre><code>system 'bash','-c','for ((i=10;i--;));do'."\n". 'printf "Number: %2d\n" $i'."\n". 'done'; </code></pre> <p>Using dots <code>.</code> for <em>concatening</em> part of (script part) string, there are always 3 arguments.</p>
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