show-cert

#!/bin/sh
# Display human-readable information from a certificate.
set -e

file="$1"
[ "$file" = "-" ] && file=""

if [ -n "$file" -a ! -f "$file" ] || [ -z "$file" -a -t 0 ]; then
  echo "Usage: show-cert <file>" >&2
  exit 1
fi

format=pem
[ "${file##*.}" = "cer" ] && format=der

exec openssl x509 -inform "$format" ${1:+-in "$1"} -noout -text \
  -nameopt multiline -certopt no_pubkey,no_sigdump