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Top Forums UNIX for Dummies Questions & Answers Remove a secondary group from user (Linux) Post 302950949 by RudiC on Thursday 30th of July 2015 10:46:31 AM
Old 07-30-2015
If you really have to use usermod, try
Code:
usermod -G$(id -nG john | sed 's/^[^ ]* //;s/asmadmin//;s/  */,/g') john

, assuming the first group listed is the primary group. You may want to define a shell function.
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groupdel(1M)															      groupdel(1M)

NAME
groupdel - delete a group from the system SYNOPSIS
group DESCRIPTION
The command deletes a group from the system by removing the appropriate entry from the file. The command must be used with the group argument which is the name of the group to be deleted. The name consists of a string of printable characters that may not include a colon or newline Refer to usergroupname(5) to understand the functionality changes with the Numeric User Group Name feature. Options The command uses the following option: Exercise the safe delete feature. That is, if the gid of the primary group of any system user matches the gid of group, then group is not deleted. NIS The command is aware of NIS user entries. Only local groups may be deleted with Attempts to delete an NIS group will result in an error. NIS groups must be administered from the NIS server. If is used on a system where NIS is installed, it may fail with the error (return value 6), if the group specified is an NIS group (see group(4)). RETURN VALUE
exits with one of the following values: No error. Invalid command syntax. Invalid argument supplied to an option. group does not exist. Cannot modify the file. file or file busy. Another command may be modifying the file. Unable to open or file is non-existent. group is busy or cannot delete the primary group. EXAMPLES
Delete the group from the file if it exists: WARNINGS
Because many users may try to write the file simultaneously, a password locking mechanism was devised. If this locking fails after subse- quent retrying, terminates. FILES
SEE ALSO
users(1), groupadd(1M), groupmod(1M), logins(1M), useradd(1M), userdel(1M), usermod(1M), group(4), usergroupname(5). STANDARDS CONFORMANCE
groupdel(1M)
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