Please master guiding] [command line only allowed a few shells to achieve the problems 1, according to documents /etc/passwd ":" of a classification field, and output the result of the third to the fifth line; 2, CD iso documents produced, while the CD after the finish; 3, you print out the number of machines installed Ethernet NIC, and then output the concrete-block NIC; Please master guiding] [command line only allowed a few shells to achieve the problems 1, sort /etc/passwd | sed - n '3,5p' 2 cp /dev/cdrom xxxx.iso, named eject t [ Closed window ]