In subshell how do you get its process id?

Question

I know I can get process id of the main shell by $$, but how do you get PID of subshell created by e.g. ( ... ) from within the block?

score 1 · Answer 1 · answered Mar 18 '20 at 18:12

1

You can use $BASHPID, to see the difference :

(echo $$ $BASHPID)

answered Mar 18 '20 at 18:12

Philippe

That seems to work in Bash, I also wonder, how can you do it in POSIX shell? – jarno Mar 18 '20 at 18:19
1

(pid=$(exec sh -c 'echo "$PPID"'); echo "$$ $pid"). See https://unix.stackexchange.com/a/484464/40484 – Paulo Tomé Mar 18 '20 at 18:25

1 Answers1