4 系统管理命令................................................................................................................................24
4.1 df..........................................................................................................................................24
4.2 top........................................................................................................................................25
4.3 free.......................................................................................................................................27
4.4 quota....................................................................................................................................28
4.5 at..........................................................................................................................................29
4.6 lp..........................................................................................................................................29
4.7 useradd.................................................................................................................................30
4.8 groupadd..............................................................................................................................31
4.9 kill........................................................................................................................................31
4.10 crontab...............................................................................................................................33
5 网络操作命令................................................................................................................................36
5.1 ifconfig................................................................................................................................36
5.2 ip..........................................................................................................................................37
5.3 ping......................................................................................................................................39
5.4 netstat...................................................................................................................................39
5.5 telnet....................................................................................................................................41
5.6 ftp.........................................................................................................................................42
5.7 route.....................................................................................................................................43
5.8 rlogin...................................................................................................................................44
5.9 rcp........................................................................................................................................45
5.10 finger.................................................................................................................................45
5.11 mail....................................................................................................................................46
5.12 nslookup............................................................................................................................47
6 网络安全命令................................................................................................................................50
6.1 passwd.................................................................................................................................50
6.2 su.........................................................................................................................................51
6.3 umask...................................................................................................................................51
6.4 chgrp....................................................................................................................................52
6.5 chmod..................................................................................................................................53
6.6 chown..................................................................................................................................55
2022-3-10
第 2 页, 共 72 页