loop over rows of hosts in a file and fetch the cerificate of each host and display the cerificate date's

gistfile1.txt

#!/bin/sh
#
# usage: check_dates_all_hosts.sh hosts_file
# where hosts_:file is a file with one hostename per row
#

function get_cerificate {
  REMHOST=$1
  REMPORT=${2:-443}

  echo |\
  openssl s_client -connect ${REMHOST}:${REMPORT} 2>&1 |\
  sed -ne '/-BEGIN CERTIFICATE-/,/-END CERTIFICATE-/p' |\
  openssl x509 -noout -subject -dates
  
}

cat $1 | while read line
do
   echo $line
   get_cerificate $line
done