Bash script for converting pfx certificates (from Windows) to key / pem (to be used in Linux)

pfx2pem.sh

#!/usr/bin/env bash
#
# pfx2pem
# Jonas Björk <jonas.bjork@gmail.com>
# 2017-09-15, Helsingborg
#

set -e

if [ $# -lt 1 ]; then
  echo ""
  echo "This script will convert a pfx certificate to key / pem"
  echo ""
  echo "Syntax:"
  echo "    ${0} file.pfx"
  exit 1
fi

if [ ! -f $1 ] ; then
  echo "Error: Could not find certificate file $1"
  exit 1
fi

if [ -z $(whereis openssl | awk '{print $2}') ] ; then
  echo "Error: Could not find openssl in path"
  exit 1
fi

INCERT=${1}

echo "Extracting key to ${INCERT:0:-4}.key"
if [ -f ${INCERT:0:-4}.key ] ; then
  echo "Error: ${INCERT:0:-4}.key already exists."
  exit 1
fi
openssl pkcs12 -in ${INCERT} -nocerts -out ${INCERT:0:-4}.tmp
openssl rsa -in ${INCERT:0:-4}.tmp -out ${INCERT:0:-4}.key
rm ${INCERT:0:-4}.tmp

echo "Extracting certificate to ${INCERT:0:-4}.pem"
if [ -f ${INCERT:0:-4}.pem ] ; then
  echo "Error: ${INCERT:0:-4}.pem already exists."
  exit 1
fi
openssl pkcs12 -in ${INCERT} -clcerts -nokeys -out ${INCERT:0:-4}.pem

echo "Done. Have a nice day."
exit 0