This question is the first follow-up of: Shell POSIX OpenSSL file decryption script

Please read it before you continue reading this. Thank you.

I only have one new problem solved and I would like you to have a look.

That problem being accepting one option -o output_directory.

I have little idea if I did this the best way, but it works.

The code follows:

#!/bin/sh  bold=$  (tput bold) red=$  (tput setaf 1) yellow=$  (tput setaf 3) nocolor=$  (tput sgr0)  bold_red=$  {bold}$  {red} bold_yellow=$  {bold}$  {yellow}  print_usage_and_exit() {     echo "Usage: $  0 [-o output_directory] filename_to_decrypt"     exit 1 }  print_error_and_exit() {     echo "$  {bold_red}$  1 Exit code = $  2.$  {nocolor}" 1>&2     exit "$  2" }  while getopts ":o:" option do     case "$  {option}" in         o)           given_output_directory=$  {OPTARG}           ;;         h | *)           print_usage_and_exit           ;;     esac done  shift $  ((OPTIND - 1))  [ "$  #" -eq 0 ] && print_usage_and_exit  [ "$  #" -gt 1 ] && print_error_and_exit "Multiple files are not supported." 2  [ ! -f "$  1" ] && print_error_and_exit "The given argument is not an existing file." 3  input_filename="$  1"  [ ! -r "$  input_filename" ] && print_error_and_exit "Input file is not readable by you." 4  input_filepath=$  (dirname "$  input_filename")  if [ -z $  {given_output_directory} ] then     output_directory="$  input_filepath" else     output_directory="$  given_output_directory" fi  [ ! -w "$  output_directory" ] && print_error_and_exit "Destination directory is not writable by you." 5  filename_extracted_from_path=$  (basename "$  input_filename") filename_without_enc_extension="$  {filename_extracted_from_path%.enc}"  if [ "$  filename_extracted_from_path" = "$  filename_without_enc_extension" ] then     # the file has a different than .enc extension or no extension at all     # what we do now, is that we append .dec extention to the file name     output_filename="$  output_directory/$  filename_extracted_from_path".dec else     # the file has the .enc extension     # what we do now, is that we use the file name without .enc extension     output_filename="$  output_directory/$  filename_without_enc_extension" fi  [ -f "$  output_filename" ] && print_error_and_exit "Destination file exists." 6  if ! pv -W "$  input_filename" | openssl enc -aes-256-cbc -md sha256 -salt -out "$  output_filename" -d 2> /dev/null then     [ -f "$  output_filename" ] && rm "$  output_filename"      print_error_and_exit "Decryption failed." 7 else     echo "$  {bold_yellow}Decryption successful.$  {nocolor}"      exit 0 fi