http://www.hmes.kh.edu.tw/~jona/redhat/ ... ccount.htm
二、批次更改學生帳號的密碼
2.1 用 qe 將 student.txt 的最後一個欄位 user id 全部刪除
student.txt 的格式為:username:password
2.2 批次更改學生在 Linux 上的密碼
chpasswd 是系統內一個批次更改密碼的指令
chpasswd < /tmp/student.txt 或 /usr/bin/chpasswd < /tmp/student.txt
student.txt 所在位置仍為 /tmp
SQL
select mail,"m",mail,"y",substr(birth,6,2),"m",substr(birth,9,2) from user where vacate = 0 and mail <> '0' and mail <> ''
整批改mail 帳號
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