1PASSWD(1) General Commands Manual PASSWD(1)
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6 passwd - change login password
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9 passwd [ name ]
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12 This command changes (or installs) a password associated with the user
13 name (your own name by default).
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15 The program prompts for the old password and then for the new one. The
16 caller must supply both. The new password must be typed twice, to
17 forestall mistakes.
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19 New passwords must be at least four characters long if they use a suf‐
20 ficiently rich alphabet and at least six characters long if monocase.
21 These rules are relaxed if you are insistent enough.
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23 Only the owner of the name or the super-user may change a password; the
24 owner must prove he knows the old password.
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27 /etc/passwd
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30 login(1), passwd(5), crypt(3)
31 Robert Morris and Ken Thompson, Password Security: A Case History
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35 PASSWD(1)