1CHPASSWD(8)               System Management Commands               CHPASSWD(8)
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NAME

6       chpasswd - update passwords in batch mode
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SYNOPSIS

9       chpasswd [options]
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DESCRIPTION

12       chpasswd reads a list of user name and password pairs from standard
13       input and uses this information to update a group of existing users.
14       Each line is of the format:
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16       user_name:password
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18       By default the supplied password must be in clear-text. Default
19       encryption algorithm is DES, but this setting can be changed in
20       /etc/login.defs. Red Hat uses MD5 to encrypt passwords by default. Also
21       the password age will be updated, if present.
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23       This command is intended to be used in a large system environment where
24       many accounts are created at a single time.
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OPTIONS

27       The options which apply to the chpasswd command are:
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29       -e, --encrypted
30          Supplied passwords are in encrypted form.
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32       -h, --help
33          Display help message and exit.
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35       -m, --md5
36          Use MD5 encryption instead of DES when the supplied passwords are
37          not encrypted.
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CAVEATS

40       Remember to set permissions or umask to prevent readability of
41       unencrypted files by other users.
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SEE ALSO

44       passwd(1), newusers(8), useradd(8).
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48System Management Commands        07/30/2006                       CHPASSWD(8)