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RedHat 9 (Linux i386) - man page for chpasswd (redhat section 8)

CHPASSWD(8)				       System Manager's Manual					  CHPASSWD(8)

NAME
chpasswd - update password file in batch
SYNOPSIS
chpasswd [-e]
DESCRIPTION
chpasswd reads a file of user name and password pairs from standard input and uses this information to update a group of existing users. Without the -e switch, the passwords are expected to be cleartext. With the -e switch, the passwords are expected to be in encrypted form. Each line is of the format user_name:password The named user must exist. The supplied password will be encrypted as necessary, and the password age updated, if present. This command is intended to be used in a large system environment where many accounts are created at a single time.
CAVEATS
The input file must be protected if it contains unencrypted passwords.
SEE ALSO
passwd(1), newusers(8), useradd(8)
AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com) CHPASSWD(8)


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