單項(xiàng)選擇題

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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填空題

What command with all options and/or parameter will send the signal USR1 to any executing process of program apache2？（）

答案： KILLALL-SUSR1APACHE2

填空題

Which command （without options） would you use to display how much space is available on all mounted partitions？（）

答案： /BIN/DF

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The command echo $! will produce what output？（）

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What command with all options and/or parameter will send the signal USR1 to any executing process of program apache2？（）

Which command （without options） would you use to display how much space is available on all mounted partitions？（）

The command echo $! will produce what output？（）

What command with all options and/or parameter will send the signal USR1 to any executing process of program apache2？（）

Which command （without options） would you use to display how much space is available on all mounted partitions？（）