单项选择题
A. export PATH=pwd
B. export PATH=$PWD
C. export PATH=$PATH:pwd
D. export PATH=$PATH:$PWD
单项选择题 Which of the following commands can be used to show all disks configured on the system?()
单项选择题 An operator needs to create /dir1/dir2/dir3. The /dir1 does not exist. What command can be used to create dir2 and dir3?()
单项选择题 How can an operator list all its history of commands in one step?()