grp permissions in unix

I have a file with u+rwx and g+rwx. It shows as follows:

-rwxrwx---    1 myid1  abcd          829 Nov 20 10:46 run_con.ksh

The groups for this myid1 are : abcd, grp1, grp2

Another userid - say myid2 tries to more the ksh and fails. I look at its groups. They are: grp2, grp3

I am wondering why it failed given the two ids share a group between them, namely,  grp1. So the second id - myid2 - should have been able to access the script given this fact, no?
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omarfaridConnect With a Mentor Commented:
the perms are given to group abcd and not to other groups.

you either change the file group to the group grp2 with command chgrp


you add the user to group abcd
LuckyLucksAuthor Commented:
Typo, the shared group between the two ids is grp2 NOT grp1.
It's only the user and group owning the file which count here.

Only user myid1 and members of the group abcd can access and execute this file, the membership of the users in other groups is in no way relevant.
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