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istudyatuni/check-domain-cert-expire.sh

Created April 19, 2026 09:11
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Check expiration of domain certificate
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check-domain-cert-expire.sh
#!/usr/bin/env bash
set -euo pipefail
readonly DOMAIN='ENTER YOUR DOMAIN'
readonly DAY_SEC=86400
expiry="$(echo | \
openssl s_client -servername "$DOMAIN" -connect "$DOMAIN:443" 2>/dev/null | \
openssl x509 -noout -enddate | \
cut -d= -f2)"
expiry_sec="$(date -d "$expiry" +%s)"
now_sec="$(date +%s)"
days_left=$(( ($expiry_sec - $now_sec) / $DAY_SEC ))
echo "Domain $DOMAIN expires at $expiry (days left: $days_left)"
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