サーバーのよく使うコマンドメモ| passwd

2015年3月14日

コマンド サーバー テクノロジー

Summery

Linux,macのユーザーパスワードを変更する。 管理権限の場合は、現在ログインしているユーザー以外も編集できる。

Construction

$ passwd [*user] $ *inpput-password

Sample

# 現在ログイン中のユーザーパスワードの変更 $ passwd $ ***** # 管理権限での別ユーザーパスワード変更 $ passwd hoge $ *****

Discription

NAME passwd -- modify a user's password SYNOPSIS passwd [-i infosystem [-l location]] [-u authname] [user] DESCRIPTION The passwd utility changes the user's password. If the user is not the super-user, passwd first prompts for the current password and will not continue unless the correct password is entered. When entering the new password, the characters entered do not echo, in order to avoid the password being seen by a passer-by. The passwd utility prompts for the new password twice in order to detect typing errors. The new password should be at least six characters long and not purely alphabetic. Its total length should be less than _PASSWORD_LEN (currently 128 characters), although some directory systems allow longer passwords. Numbers, upper case letters, and meta characters are encouraged. Once the password has been verified, passwd communicates the new password to the directory system. -i infosystem This option specifies where the password update should be applied. Under Mac OS X 10.5 and later, supported directory systems are: PAM (default) Pluggable Authentication Modules. opendirectory A system conforming to Open Directory APIs and support- ing updates (including LDAP, etc). If no -l option is specified, the search node is used. file The local flat-files (included for legacy configura- tions). nis A remote NIS server containing the user's password. -l location This option causes the password to be updated in the given location of the chosen directory system. for file, location may be a file name (/etc/master.passwd is the default) for nis, location may be a NIS domainname for opendirectory, location may be a directory node name for PAM, location is not used -u authname This option specifies the user name to use when authenticat- ing to the directory node. user This optional argument specifies the user account whose pass- word will be changed. This account's current password may be required, even when run as the super-user, depending on the directory system. FILES /etc/master.passwd The user database /etc/passwd A Version 7 format password file /etc/passwd.XXXXXX Temporary copy of the password file SEE ALSO chpass(1), login(1), dscl(1), passwd(5), pwd_mkdb(8), vipw(8) Robert Morris and Ken Thompson, UNIX password security. HISTORY A passwd command appeared in Version 6 AT&T UNIX.

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