1、命令别名:alias、unalias
当命令过长的时候可以使用别名来代替
用法:alias + 别名=‘长命令’ (注意:等号前后不能有空格)
[root@localhost data]# alias la='ls -al'
[root@localhost data]# la
total 24
drwxr-xr-x 5 www www 4096 Dec 4 09:29 .
dr-xr-xr-x. 27 root root 4096 Oct 14 09:50 ..
-rwxr--r-- 1 www www 260 Dec 4 09:29 1.txt.txt
drwxr-xr-x 7 root root 4096 Nov 30 10:54 download
drwxr-xr-x 3 www www 4096 Dec 1 11:21 text
drwxr-xr-x 2 www www 4096 Nov 29 17:36 www
取消别名:unalias + 别名
[root@localhost data]# unalias la
[root@localhost data]# ls
1.txt.txt download text www
[root@localhost data]# la
-bash: la: command not found
(1)查询全部的命令
[root@localhost data]# history
1 vi /etc/sysconfig/network-scripts/ifcfg-eth0
2 service network restart
3 ll
4 netstat -tlnp
5 ifconfig
(2)查询最近使用的几个命令
[root@localhost data]# history 5
961 [root@localhost data]# ls
962 1.txt.txt download text www
963 [root@localhost data]# la
964 -bash: la: command not found
965 history 5