$BASHPID
The following example shows how regular PID (Process ID) $$ fails to get the correct PID for a subshell. While $BASHPID gives the correct PID
unhappy_func(){
echo "unhappy_func triggered (BASHPID: $BASHPID, PID=$$)"
return 1
}
happy_func(){
echo "happy_func triggered (BASHPID: $BASHPID, PID=$$)"
return 0
}
main() {
echo "main PID: $$"
happy_func && (unhappy_func || return 1)
echo.green "happy finish"
}
main "${@}" || echo.red "Unhappy finish"
The output looks like
main PID: 9200
happy_func triggered (BASHPID: 9200, PID=9200)
unhappy_func triggered (BASHPID: 9201, PID=9200)
happy finish
Also note $BASHPID does not work in zsh.
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