变量 变量是在程序中保存用户数据的一块内存空间,变量名就是这个内存空间的地址 计算机重启后,变量数值会丢失 标准的命名为x="xxxxxxx" ...
grep [OPTION...] PATTERNS [FILE...] grep [OPTION...] -e PATTERNS ... [FI...
man [OPTION...] [SECTION] PAGE... an interface to the on-line reference ...
userdel [options] LOGIN delete a user account and related files 删除用户 如果有...
usermod [options] LOGIN modify a user account 更改用户属性 usermod不允许你改变正在线上的使...
useradd [-d home] [-s shell] [-c comment] [-m [-k template]] [-f inactiv...
updatedb [OPTION]... Update a mlocate database 更新数据库文件 数据库一天更新一次,/tmp目录不...
enable [-a] [-dnps] [-f filename] [name ...] Enable and disable builtin ...
hash [-lr] [-p pathname] [-dt] [name ...] Remember or display program lo...