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

你可能感興趣的試題

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

99色精品-9色在线-99色在线-99色视频 国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

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

你可能感興趣的試題

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？（）

99色精品-9色在线-99色在线-99色视频国产欧美日产一区二区三区_亚洲精品亚洲人成在线观看_四虎在线精品永久观看_免费一级a一片久久精

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？（）