In redhat linux we can add users with useradd command
# useradd username
to assign passwd we must use passwd command..
# passwd username
then specify passwd……….
information about all users will be saved in /etc/passwd file….

all passwords of the users must be saved in /etc/shadow in encrypted form…

all information about groups will saved in /etc/group file
we can add group using
# groupadd groupname

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