chpasswd - update passwords in batch mode
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:
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.
The options which apply to the chpasswd command are:
Remember keep protected for reading by others file passed to standard input chpasswd command if it contains unencrypted passwords.
passwd(1) , newusers(8) , useradd(8) .
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