#!/usr/bin/env bash
set -o errexit
set -o pipefail
set -o nounset
#set -o xtrace
UFILE="/home/yourdir/users.txt"
TFILE="/tmp/out.tmp.$$"
OFILE="/home/yourdir/credentials.txt"
for line in $(cat ${UFILE})
do
       echo "User name: ${line} ... generating password"
       sleep 5
       mkpasswd -l 8 -s 0 >> ${TFILE}
done
paste -d':' ${UFILE} ${TFILE} > ${OFILE}
echo "New passwords have been generated for the users!!"
rm ${TFILE}
sleep 5
echo
echo "Passwords will now be reset ......."
sleep 5
echo
cat ${OFILE} > chpasswd
sleep 5
echo
echo "User account passwords have been reset"
exit