单选题The command echo $! will produce what output？（）Athe process id of last background commandBthe exit status of the last commandCthe exit status of the last background commandDthe process id of the current shellEthe name of the command being executed
题目
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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参考答案和解析
正确答案：
C
解析：
暂无解析