write script to remove users from class group

[simonLeary42]

No description provided.

[simonLeary42]

changes:

• check for too many arguments as well as not enough arguments
• add trailing newline to error messages
• put variables in quotes in error messages
• return nonzero exit code on failure
• change some variable names

root@web:/var/www/unity-web-portal/workers# php ./remove-users-from-group.php a a a a a a a
Usage: ./remove-users-from-group.php group_name filename_of_users_to_remove
root@web:/var/www/unity-web-portal/workers# php ./remove-users-from-group.php pi_user1005_org3_test foobar
PHP Warning:  fopen(foobar): Failed to open stream: No such file or directory in /var/www/unity-web-portal/workers/remove-users-from-group.php on line 17
Can't open 'foobar'
root@web:/var/www/unity-web-portal/workers# php ./remove-users-from-group.php pi_user1005_org3_testasdlkjasdlkj foobar
No such group 'pi_user1005_org3_testasdlkjasdlkj'
root@web:/var/www/unity-web-portal/workers# php ./remove-users-from-group.php pi_user1005_org3_test /tmp/file
root@web:/var/www/unity-web-portal/workers# php ./remove-users-from-group.php pi_user1005_org3_test /tmp/file
Skipping 'user203_org3_test' who doesn't appear to be in 'pi_user1005_org3_test'