decrypt.sh

#!/bin/sh

if [ "$1" == "" ]; then
  echo "decrypt file"
  exit 1
fi

openssl aes-256-cbc -d -in "$1" -out "$1_dec" 2> /dev/null

if [ "$?" == "0" ]; then
  echo "Decrypting..."
  rm -fr "$1"
  mv "$1_dec" "$1"
fi

encrypt.sh

#!/bin/sh

if [ "$1" == "" ]; then
  echo "encrypt file"
  exit 1
fi

openssl aes-256-cbc -salt -in "$1" -out "$1_enc"
mv "$1_enc" "$1"