(TIL) Nix: PID Of The Current Shell

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$ expands to the process ID of the shell. So, you can see the PID of the current shell with echo $$.

> echo $$
36609

> zsh

> echo $$
45431

> exit

> echo $$
36609

See the Special Paramaters section of man bash for more details.

Via jbranchaud/til.

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