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If I have the script "script1.sh" and I want to make it print its own PID as a first step. How can I do this in bash?

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The PID of the currently running script is $$

http://www.gnu.org/software/bash/manual/bashref.html#index-_0024_0024

($$) Expands to the process ID of the shell. In a () subshell, it expands to the process ID of the invoking shell, not the subshell.

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    How do you get the PID of the subshell? – trysis May 11 '15 at 2:42
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    @trysis In bash > 4, the subshell's PID (as any shell's PID) is stored in $BASHPID – kos May 11 '15 at 4:09

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