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Full Discussion: Group Exist Scripting
Top Forums Shell Programming and Scripting Group Exist Scripting Post 302387493 by Scrutinizer on Saturday 16th of January 2010 09:25:46 AM
Old 01-16-2010
You can only grep the group file if your machine is not hooked up to nis+ or ldap or something. On linux you could do something like this:
Code:
newgrp="somegroup"
if ! getent group $newgroup >/dev/null; then
  newgroup=users
fi

On HP-UX you can use grget instead of getent group, so it depends what tool you should use. I am sure there are other methods too.
 

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LEARN ABOUT SUSE

newgrp

newgrp(1)						      General Commands Manual							 newgrp(1)

NAME

       newgrp -  change effective group ID sg - execute command with different group ID

SYNOPSIS

       newgrp [-l] [group]
       sg group -c command

DESCRIPTION

       The  newgrp  command changes the user's real and effetive group ID by replacing the current shell with a new shell. A new shell is launched
       even if an error occours.

       A password is requested if the group has a password and the user is not listed in the group file as being a member of that group. The pass-
       word can be changed with the gpasswd(1) command.

       If the new effective group ID is not in the supplementary group list, newgrp will add the new group ID to the supplementary list, too.

       With  no  operands  and options, newgrp changes the user's group IDs (real and effective) back to the group specified in password and group
       file.

       The sg command works like the newgrp command, except that it executes the given command with /bin/sh and upon exit the group ID of the cur-
       rent shell is not changed.

OPTIONS

       -l, --login
	      reinitialize the environment as if the user logged in.

       --help Print a help list.

       -u, --usage
	      Print a short usage message.

       -v, --version
	      Print program version.

SEE ALSO

       gpasswd(1), group(5), passwd(1), passwd(5), su(1)

AUTHOR

       Thorsten Kukuk <kukuk@suse.de>

pwdutils							    April 2004								 newgrp(1)
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