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    <p>It's the process id of the bash process itself.</p> <p>You might use it to track your process over its life - use <a href="http://linux.die.net/man/1/ps" rel="noreferrer"><code>ps -p</code></a> to see if it's still running, send it a signal using <code>kill</code> (to pause the process for example), change its priority with <code>renice</code>, and so on.</p> <p>Process ids are often written to log files, especially when multiple instances of a script run at once, to help track performance or diagnose problems.</p> <p>Here's <a href="http://www.gnu.org/software/bash/manual/bashref.html#Special-Parameters" rel="noreferrer">the bash documentation</a> outlining special parameters.</p> <p><a href="http://www.gnu.org/software/bash/manual/bashref.html#Bash-Variables" rel="noreferrer"><code>BASHPID</code></a>, mentioned by ghostdog74, was added at version 4.0. Here's an example from Mendel Cooper's <em><a href="http://tldp.org/LDP/abs/abs-guide.pdf" rel="noreferrer">Advanced Bash-Scripting Guide</a></em> that shows the difference between <code>$$</code> and <code>$BASHPID</code>:</p> <pre><code>#!/bin/bash4 echo "\$\$ outside of subshell = $$" # 9602 echo "\$BASH_SUBSHELL outside of subshell = $BASH_SUBSHELL" # 0 echo "\$BASHPID outside of subshell = $BASHPID" # 9602 echo ( echo "\$\$ inside of subshell = $$" # 9602 echo "\$BASH_SUBSHELL inside of subshell = $BASH_SUBSHELL" # 1 echo "\$BASHPID inside of subshell = $BASHPID" ) # 9603 # Note that $$ returns PID of parent process. </code></pre>
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    1. POWhat is '$$' in the bash shell?
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    1. POWhat is '$$' in the bash shell?
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    1. COOr you could link directly to the official Bash documentation: http://www.gnu.org/software/bash/manual/bashref.html#Special-Parameters http://www.gnu.org/software/bash/manual/bashref.html#Shell-Variables
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    2. COGood idea - done, thanks.
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