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ckressibucher/check_expiration.sh

Created December 21, 2019 13:18
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check expiration date of TLS certificate
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check_expiration.sh
#!/bin/bash
hostname=$1
expire_str=$(true | openssl s_client -connect $hostname:443 2>/dev/null | openssl x509 -noout -enddate | cut -d = -f2)
expire=$(date -d "$expire_str" +%s)
current=$(date +%s)
secs_left=$(expr $expire - $current)
days_left=$(expr $secs_left / 3600 / 24)
echo $hostname exires at $expire_str "(this is in $secs_left seconds, ~ $days_left days)"
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