cut -d: -f1 /etc/passwd

#!/bin/bash

cut -d : -f 1 /etc/passwd | while read user
do
    # check if user is in specific group
    `groups $user` | grep -q <SPECIFICGROUP>
    if [ $? -ne 0 ] ; then
        continue;
    fi

    printf "User=${user},password=`awk -F: -v user=$user '$1 == user { print $2 ;} '`"
done

gid=$(getent group somegroup | awk -F : '{print $3}')
getent passwd | awk -F : -v gid="$gid" '$4 == gid'

getent passwd | awk -F : -v gid="$gid" '$4 == gid {print $5}'

usernames=$(getent group somegroup | awk -F : '{print $3 "," $4}')
gid=${usernames%%,*}; usernames=${usernames#*,}
getent passwd | awk -F : -v gid="$gid" -v usernames="$usernames" '
    BEGIN {split(usernames, names, /,/); for (name in names) user[name]=1}
    name[$1] || $4==gid
'

… | awk … | join -t : -j 1 - /etc/shadow

#!/bin/bash
echo "enter the groupname"
read g
for user in `getent group $g| awk -F ":" '{print $NF}'| sed "s/,/ /g"`
do
echo $user
sed -n '/'$user'/p' /etc/passwd
done| sed '1i below are list of users in group and users password'