How to set password policy in RHEL ?

To set Password Expriation days
#vi /etc/login.defs
PASS_MAX_DAYS 42
PASS_MIN_DAYS 1
PASS_MIN_LEN 8
PASS_WARN_AGE 7



To impliment script
#vi passwdage.sh
#Set Password Expiration Days
sed -i 's/PASS_MAX_DAYS [^ ]*/PASS_MAX_DAYS 42/g' /etc/login.defs
sed -i 's/PASS_MIN_DAYS [^ ]*/PASS_MIN_DAYS 1/g' /etc/login.defs
sed -i 's/PASS_MIN_LEN [^ ]*/PASS_MIN_LEN 8/g' /etc/login.defs
sed -i 's/PASS_WARN_AGE [^ ]*/PASS_WARN_AGE 7/g' /etc/login.defs
awk '/PASS_MAX_DAYS [^ ]*/ { print $0}' /etc/login.defs
awk '/PASS_MIN_DAYS [^ ]*/ { print $0}' /etc/login.defs
awk '/PASS_WARN_AGE [^ ]*/ { print $0}' /etc/login.defs
sleep 5