单选题The command echo $! will produce what output？（）A the process id of last background commandB the exit status of the last commandC the exit status of the last background commandD the process id of the current shellE the name of the command being executed
单选题
The command echo $! will produce what output？（）
A
the process id of last background command
B
the exit status of the last command
C
the exit status of the last background command
D
the process id of the current shell
E
the name of the command being executed
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