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Freebsd, unix | mail notification about password expiration

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example script, shell

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#!/bin/sh
#432000 5 days

time_to_expire=0
current_timestamp=$(date +%s)
user_timestamp=0
notify_threshold=432000

for user in $(cat /etc/passwd | cut -d : -f 1)
do
 user_timestamp=$(pw showuser -n $user | cut -d: -f 6)
 time_to_expire=$(($user_timestamp-$current_timestamp))
 
 echo $user
 echo $time_to_expire
 
if [ $time_to_expire -gt 0 ] && [ $time_to_expire -lt $notify_threshold ]; then
 $(echo "Your password will expire, change it" | mail -s "Mail password expiration" $user@my.target.user.com)
fi

done | paste -d " " - -

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