-bash-4.1# less /etc/profile
profile    profile.d/ 
-bash-4.1# less /etc/profile
-bash-4.1# cat /proc/sys/vm/swappiness
60
-bash-4.1# free -g
             total       used       free     shared    buffers     cached
Mem:            27         27          0          0          0         12
-/+ buffers/cache:         14         13
Swap:            4          3          0
-bash-4.1# free -m
             total       used       free     shared    buffers     cached
Mem:         28200      28018        181          0        141      12993
-/+ buffers/cache:      14883      13316
Swap:         4195       3373        822

错删了一些文件，bash下的提示符变成了这个样

-bash-4.1#

这是因为丢失了用户目录下的配置文件

.bash_profile  .bashrc

不建议去纯手敲恢复，系统环境下其实已经放置了模板，只需拷贝到自己家目录下即可

/etc/skel/

从/etc/skel/目录下copy  .bash_profile  .bashrc两个文件即可

cp -a .bash_profile ~/
cp -a .bashrc ~/

大功告成。