[root@localhost etc]# type home --检查是否占用
-bash: type: home: not found
[root@localhost etc]# alias home='cd /home/wwwroot;ll' --创建命令
[root@localhost etc]# home --测试
total 16
drwxr-xr-x. 3 www www 4096 Nov 21 08:45 default
drwxr-xr-x 5 root root 4096 Nov 21 09:14 kaibuy
drwxr-xr-x 2 www www 4096 Nov 21 09:12 pic.kq126.pw
drwxr-xr-x 2 www www 4096 Nov 21 09:11 upload.kq126.pw
[root@localhost wwwroot]#--以上加的东西，重启就失效，对别人也无效，要想永久生效，须将相关命令加入：
[root@localhost etc]# vi /etc/bashrc
--在非if...fi的任意地方加上相应命令即可。
echo "alias g='cat /etc/group'" >> /etc/bashrc
echo "alias u='cat /etc/passwd'" >> /etc/bashrc
echo "alias p='cat /etc/shadow'" >> /etc/bashrc
echo "alias conf='cd /usr/local/nginx/conf'" >> /etc/bashrc