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$? in shell script Code Example
$? in shell script 
$? it give the exit status of last command
$$ in shell script 
$$ 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.
Source: unix.stackexchange.com



Shell

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