A Linux administrator is troubleshooting an issue with a shell script. Users in the accounting department are unable to run the script, but users in the sales department are not having issues. Users i

chgrp accounting script.sh changes the group owner to 'accounting', which would give accounting users the group execute bit but would revoke execute access from sales department users who are no longer the group.

chmod 644 sets permissions to rw-r--r--, which removes the execute bit from all categories and prevents anyone from running the script.

chown accounting script.sh changes the file's owner to the 'accounting' user/group, which does not add execute permission for the 'other' category where accounting department members currently reside.

The permission string '-r-xr-xr--' shows the owner (joe) and group (sales) both have execute permission, but the 'other' category has only read permission (r--). Accounting users fall into 'other' because they are neither 'joe' nor members of 'sales'. Running 'chmod a+x script.sh' adds the execute bit for owner, group, and other simultaneously, granting accounting users the ability to run the script without altering ownership or breaking existing access.