手贱，修改了/etc/profile,无意外出错了，所有命令都无法使用,好在export可以使用。
vim /etc/profile -bash: vim: command not found [oio@nlp ~]$ cat -bash: cat: command not found [oio@nlp ~]$ vi -bash: vim: command not found [oio@nlp ~]$ vim -bash: vim: command not found [oio@nlp ~]$ vi -bash: vim: command not found [oio@nlp ~]$ tail -bash: tail: command not found [oio@nlp ~]$ ps -bash: ps: command not found
1.执行： export PATH=/usr/bin:/usr/sbin:/bin:/sbin
2.执行： vim /etc/profile
3.执行： source /etc/profile
还是谨慎操作，尽量在~/.bashrc中操作，不至于影响很大。
收工
