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Top Forums Shell Programming and Scripting IF $USER is not in this list of users, then do this Post 302361986 by Casey on Wednesday 14th of October 2009 03:43:14 PM
Old 10-14-2009
$? gives you the exit status of the latest command executed. In this case if this

Code:
echo 'smitha, lucyb, johnk' | grep -q ${USER}

is successfully done, then $? will be 0, else it will be 1 (or any other value between 1 and 255). Then you use that value to check if the users was found or not.
 
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ALTER 
GROUP(7) SQL Commands ALTER GROUP(7) NAME
ALTER GROUP - change role name or membership SYNOPSIS
ALTER GROUP groupname ADD USER username [, ... ] ALTER GROUP groupname DROP USER username [, ... ] ALTER GROUP groupname RENAME TO newname DESCRIPTION
ALTER GROUP changes the attributes of a user group. This is an obsolete command, though still accepted for backwards compatibility, because groups (and users too) have been superseded by the more general concept of roles. The first two variants add users to a group or remove them from a group. (Any role can play the part of either a ``user'' or a ``group'' for this purpose.) These variants are effectively equivalent to granting or revoking membership in the role named as the ``group''; so the preferred way to do this is to use GRANT [grant(7)] or REVOKE [revoke(7)]. The third variant changes the name of the group. This is exactly equivalent to renaming the role with ALTER ROLE [alter_role(7)]. PARAMETERS
groupname The name of the group (role) to modify. username Users (roles) that are to be added to or removed from the group. The users must already exist; ALTER GROUP does not create or drop users. newname The new name of the group. EXAMPLES
Add users to a group: ALTER GROUP staff ADD USER karl, john; Remove a user from a group: ALTER GROUP workers DROP USER beth; COMPATIBILITY
There is no ALTER GROUP statement in the SQL standard. SEE ALSO
GRANT [grant(7)], REVOKE [revoke(7)], ALTER ROLE [alter_role(7)] SQL - Language Statements 2010-05-14 ALTER GROUP(7)

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