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Full Discussion: Creating groups and users
Top Forums UNIX for Advanced & Expert Users Creating groups and users Post 302697393 by jlliagre on Thursday 6th of September 2012 05:25:42 PM
Old 09-06-2012
Code:
getent passwd username

and
Code:
getent group groupname

will tell you if the username and groupname are already used.

Replace username and groupname by their numeric id in the previous commands if you want to make sure you won't have id clash.
 

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

NAME
newusers - update and create new users in batch SYNOPSIS
newusers [new_users] DESCRIPTION
newusers reads a file of user name and cleartext password pairs and uses this information to update a group of existing users or to create new users. Each line is in the same format as the standard password file (see passwd(5)) with the following exceptions. pw_passwd This field will be encrypted and used as the new value of the encrypted password. pw_age This field will be ignored for shadow passwords if the user already exists. pw_gid This field may be the name of an existing group, in which case the named user will be added as a member. If a non-existent numerical group is given, a new group will be created having this number. pw_dir This field will be checked for existence as a directory and a new directory with the same name will be created if it does not already exist. The ownership of the directory will be set to be that of the user being created or updated. This command is intended to be used in a large system environment where many accounts are updated at a single time. CAVEATS
The input file must be protected since it contains unencrypted passwords. SEE ALSO
passwd(1), useradd(8) AUTHOR
Julianne Frances Haugh (jockgrrl@ix.netcom.com) NEWUSERS(8)
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