How to delete or remove duplicate lines in a file

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LEARN ABOUT LINUX

groupdel

GROUPDEL(8)						    System Management Commands						       GROUPDEL(8)

NAME

       groupdel - delete a group

SYNOPSIS

       groupdel group

DESCRIPTION

       The groupdel command modifies the system account files, deleting all entries that refer to group. The named group must exist.

CAVEATS

       You may not remove the primary group of any existing user. You must remove the user before you remove the group.

       You should manually check all file systems to ensure that no files remain owned by this group.

CONFIGURATION

       The following configuration variables in /etc/login.defs change the behavior of this tool:

       MAX_MEMBERS_PER_GROUP (number)
	   Maximum members per group entry. When the maximum is reached, a new group entry (line) is started in /etc/group (with the same name,
	   same password, and same GID).

	   The default value is 0, meaning that there are no limits in the number of members in a group.

	   This feature (split group) permits to limit the length of lines in the group file. This is useful to make sure that lines for NIS
	   groups are not larger than 1024 characters.

	   If you need to enforce such limit, you can use 25.

	   Note: split groups may not be supported by all tools (even in the Shadow toolsuite). You should not use this variable unless you really
	   need it.

FILES

       /etc/group
	   Group account information.

       /etc/gshadow
	   Secure group account information.

EXIT VALUES

       The groupdel command exits with the following values:

       0
	   success

       2
	   invalid command syntax

       6
	   specified group doesn't exist

       8
	   can't remove user's primary group

       10
	   can't update group file

SEE ALSO

       chfn(1), chsh(1), passwd(1), gpasswd(8), groupadd(8), groupmod(8), useradd(8), userdel(8), usermod(8)

System Management Commands					    06/24/2011							       GROUPDEL(8)

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