[Linux] 修改用户名密码

1. 普通用户或root用户修改自身登录密码：在终端使用passwd命令。

linaro@linaro-ubuntu-desktop:~$ passwd

Changing password for linaro.

(current) UNIX password:

Enter new UNIX password:

Retype new UNIX password:

passwd: password updated successfully

2. 关于passwd命令的参数及用法：

Usage: passwd [options] [LOGIN]

Options:

  -a, --all                     report password status on all accounts

  -d, --delete                  delete the password for the named account

  -e, --expire                  force expire the password for the named account

  -h, --help                    display this help message and exit

  -k, --keep-tokens             change password only if expired

  -i, --inactive INACTIVE       set password inactive after expiration

                                to INACTIVE

  -l, --lock                    lock the password of the named account

  -n, --mindays MIN_DAYS        set minimum number of days before password

                                change to MIN_DAYS

  -q, --quiet                   quiet mode

  -r, --repository REPOSITORY   change password in REPOSITORY repository

  -S, --status                  report password status on the named account

  -u, --unlock                  unlock the password of the named account

  -w, --warndays WARN_DAYS      set expiration warning days to WARN_DAYS

  -x, --maxdays MAX_DAYS        set maximum number of days before password

                                change to MAX_DAYS