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# chpasswd - Unix, Linux Command

# NAME

chpasswd - update passwords in batch mode

# SYNOPSIS

Tag | Description
--- | ---
chpasswd [options]

# DESCRIPTION

chpasswd reads a list of user name and password pairs from standard input and uses this information to update a group of existing users. Each line is of the format:

user_name:password

By default the supplied password must be in clear-text. Default encryption algorithm is DES. Also the password age will be updated, if present.

This command is intended to be used in a large system environment where many accounts are created at a single time.

# OPTIONS

The options which apply to the chpasswd command are:

Tag | Description
--- | ---
-e, --encrypted
| Supplied passwords are in encrypted form.
-h, --help
| Display help message and exit.
-m, --md5
| Use MD5 encryption instead DES when the supplied passwords are not encrypted.

# CAVEATS

Remember to set permissions or umask to prevent readability of unencrypted files by other users.

# SEE ALSO

passwd(1), newusers(8), useradd(8).

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