Bash: copy a file to all home directories - bash

Question

I have to copy (overwrite if it already exists) a file to all the home directories of users members of a same group ("students").
I found a script that I tried to adapt to my context (I have LDAP users instead of /etc/passwd so I used getent passwd to fetch usernames).
Here it is the script (cp2stud.sh):
#!/bin/bash
# subdirectory of /home/uid
DIR=".eclipse/org.eclipse.platform_3.8_155965261/configuration"
# the file to copy
FILE="/home/admin/tmp/config.ini"
# location of home dirs
UHOME="/home"
# GID of "students" group
USERS_GID=10004
# get list of users having same GID
_USERS="$(getent passwd | awk -F ':' '{if ( $4 == $USERS_GID ) print $1 }')"
for u in $_USERS
do
_dir="${UHOME}/${u}/${DIR}"
if [ -d "$_dir" ]
then
yes | /bin/cp -v "$FILE" "$_dir"
chown $(id -un $u):students "$_dir/${FILE}"
fi
done
When i try to launch it:
$ sudo cp2stud.sh
I get nothing.
Where I am mistaking?
Thanks in advance

Answer 1

_USERS="$(getent passwd | awk -v X="$USERS_GID" -F ':' '{if ( $4 == X ) print $1 }')"

Answer 2

Try this approach:
...
export USERS_GID=10004
_USERS=$(getent passwd | awk -F ':' '{if ( $4 == ENVIRON["USERS_GID"] ) print $1 }')
...
You could also do something like this:
...
USERS_GID=10004
_USERS=$(getent passwd | awk -F ':' -v gid=$USERS_GID '{if ( $4 == gid ) print $1 }')
...
Or just:
...
_USERS=$(getent passwd | awk -F ':' -v gid=10004 '{if ( $4 == gid ) print $1 }')
...

Answer 3

The following code works:
DIR=".eclipse/org.eclipse.platform_3.8_155965261/configuration"
FILE="/home/admin/tmp/config.ini"
UHOME="/home"
USERS_GID=10004
GRP_NAME=students
FILENAME=$(basename $FILE)
_USERS="$(getent passwd | awk -v X="$USERS_GID" -F ':' '{if ( $4 == X ) print $1 }')"
for u in $_USERS
do
_dir="${UHOME}/${u}/${DIR}"
if [ -d "$_dir" ]
then
yes | /bin/cp -v "$FILE" "$_dir"
chown -v $(id -un $u):$GRP_NAME "${UHOME}/${u}/${DIR}${FILENAME}"
fi
done