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单项选择题
A、①④
B、②③
C、①③
D、②④
多项选择题
A、echo The current working path is $PWD.
B、echo "The current working path is $PWD." Echo hello
C、echo 'The current working path is $PWD.' Echo hello
D、echo "The current working path is `pwd`."
E、echo The current working path is $PWD. Echo hello
单项选择题
A、date>>/tmp/date
B、date>/tmp/date
C、date 2>/tmp/date
D、date &>/tmp/date
单项选择题
A、mkdir /tmp/file
B、make /tmp/file
C、touch /tmp/file
D、mv /tmp/file