“$? no script de shell” Respostas de código

$? no script de shell

$? it give the exit status of last command 
drpzet

$$ no script de shell

$$ is the process ID (PID) of the script itself.

$BASHPID is the process ID of the current instance of Bash. This is not the same as the $$ variable, but it often gives the same result.
BlessedDog

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