#!/bin/bash
 
set -euo pipefail
IFS=$'\n\t'
 
 
error() {
msg="$1"
>&2 echo "$msg"
exit 1
}
 
test $# -eq 0 && error "Usage: $0 <certificate_file>"
 
FILE="$1"
test ! -f "$FILE" && error "$FILE: file not found."
 
EXPIRE_DATE=$(openssl x509 -in "$FILE" -noout -enddate | cut -f2 -d=);
 
echo "Certificate file: $FILE";
echo "Expiration date: $EXPIRE_DATE";
 
exit 0;