chmod-calc

#!/bin/bash
# +-----------------------------------------------------------------------------------------+
# | A simple chmod calculator for lazy engineers                                            |
# | July 2011 flip hess [email protected]                                                 |
# +-----------------------------------------------------------------------------------------+

  # Global variables:

  PATH='/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin'
  SCRIPT_PATH="${0}"

  # Functions:

  # exit function
  function die()
  {
    echo "${1}"
    exit "${2}"
  }

  ################################################################
  # The ask function.
  ################################################################
  function fAsk()
  {
    local SECTION="${1}"
    local ANSWER=""
    local COUNT='1'
    local MAXCOUNT='2'

    echo "#############################################"
    echo "Calculating permissions for ${SECTION}"
    echo "#############################################"

    # --------------------- READ PERMISSIONS --------------------- #

    # while loop for answer:
    local READ='unknown'

    while [ ${READ} = 'unknown' ]
    do
      # exit if max count is reached:
      if [ ${COUNT} -gt ${MAXCOUNT} ]
      then
        die "Too many non-related answers or enters... Exiting script!" "1"
      fi

      # ask for answer
      echo "Dou you want READ permissions for ${SECTION}?"
      echo "Please type Yes or No [Y/N]"
      read ANSWER

      # startover if no answer
      if [ -z ${ANSWER} ]
      then
        COUNT="$(echo $(( ${COUNT} +1)))"
        continue
      fi

      # define yes or no
      if [ ${ANSWER} = YES ] || [ ${ANSWER} = yes ] || [ ${ANSWER} = Y ] || [ ${ANSWER} = y ] || [ ${ANSWER} = Yes ]
      then
        READ='1'
      elif [ ${ANSWER} = 'NO' ] || [ ${ANSWER} = 'no' ] || [ ${ANSWER} = 'N' ] || [ ${ANSWER} = 'n' ] || [ ${ANSWER} = 'No' ]
      then
        READ='0'
      else
        # error message and start over
        echo "Answer not taken, please retry or type CTRL+C for exit"
        COUNT="$(echo $(( ${COUNT} +1)))"
        continue
      fi
    done

    # --------------------- WRITE PERMISSIONS -------------------- #


    # Write permissions
    local WRITE='unknown'

    while [ ${WRITE} = 'unknown' ]
    do
      # exit if max count is reached:
      if [ ${COUNT} -gt ${MAXCOUNT} ]
      then
        die "Too many non-related answers... Exiting script!" "1"
      fi

      # ask for answer
      echo "Dou you want WRITE permissions for ${SECTION}?"
      echo "Please type Yes or No [Y/N]"
      read ANSWER

      # startover if no answer
      if [ -z ${ANSWER} ]
      then
        COUNT="$(echo $(( ${COUNT} +1)))"
        continue
      fi

      # define yes or no
      if [ ${ANSWER} = 'YES' ] || [ ${ANSWER} = 'yes' ] || [ ${ANSWER} = 'Y' ] || [ ${ANSWER} = 'y' ] || [ ${ANSWER} = 'Yes' ]
      then
        WRITE='1'
      elif [ ${ANSWER} = 'NO' ] || [ ${ANSWER} = 'no' ] || [ ${ANSWER} = 'N' ] || [ ${ANSWER} = 'n' ] || [ ${ANSWER} = 'No' ]
      then
        WRITE='0'
      else
        echo "Answer not taken, please retry or type CTRL+C for exit"
        COUNT="$(echo $(( ${COUNT} +1)))"
        continue
      fi
    done

    # --------------------- EXECUTE PERMISSIONS ------------------ #

    # EXECUTE permissions
    local EXECUTE='unknown'

    while [ ${EXECUTE} = 'unknown' ]
    do
      # exit if max count is reached:
      if [ ${COUNT} -gt ${MAXCOUNT} ]
      then
        die "Too many non-related answers... Exiting script!" "1"
      fi

      # ask for answer
      echo "Dou you want EXECUTE permissions for ${SECTION}?"
      echo "Please type Yes or No [Y/N]"
      read ANSWER

      # startover if no answer
      if [ -z ${ANSWER} ]
      then
        COUNT="$(echo $(( ${COUNT} +1)))"
        continue
      fi

      # if answer:
      if [ ${ANSWER} = 'YES' ] || [ ${ANSWER} = 'yes' ] || [ ${ANSWER} = 'Y' ] || [ ${ANSWER} = 'y' ] || [ ${ANSWER} = 'Yes' ]
      then
        EXECUTE='1'
      elif [ ${ANSWER} = 'NO' ] || [ ${ANSWER} = 'no' ] || [ ${ANSWER} = 'N' ] || [ ${ANSWER} = 'n' ] || [ ${ANSWER} = 'No' ]
      then
        EXECUTE='0'
      else
        echo "Answer not taken, please retry or type CTRL+C for exit"
        COUNT="$(echo $(( ${COUNT} +1)))"
        continue
      fi
    done

    # --------------------- PROCESS RESULTS FOR ------------------ #

    # Make results:
    if   [ ${READ} = 0 ] && [ ${WRITE} = 0 ] && [ ${EXECUTE} = 0 ]
    then
      RESULT='0'
    elif [ ${READ} = 0 ] && [ ${WRITE} = 0 ] && [ ${EXECUTE} = 1 ]
    then
      RESULT='1'
    elif [ ${READ} = 0 ] && [ ${WRITE} = 1 ] && [ ${EXECUTE} = 0 ]
    then
      RESULT='2'
    elif [ ${READ} = 0 ] && [ ${WRITE} = 1 ] && [ ${EXECUTE} = 1 ]
    then
      RESULT='3'
    elif [ ${READ} = 1 ] && [ ${WRITE} = 0 ] && [ ${EXECUTE} = 0 ]
    then
      RESULT='4'
    elif [ ${READ} = 1 ] && [ ${WRITE} = 0 ] && [ ${EXECUTE} = 1 ]
    then
      RESULT='5'
    elif [ ${READ} = 1 ] && [ ${WRITE} = 1 ] && [ ${EXECUTE} = 0 ]
    then
      RESULT='6'
    elif [ ${READ} = 1 ] && [ ${WRITE} = 1 ] && [ ${EXECUTE} = 1 ]
    then
      RESULT='7'
    else
      die "Something went wrong processing results, exiting ${SCRIPT_PATH}!" "1"
    fi

    # --------------------- EXPORT VARIABLES    ------------------ #

    # export var
    if [ ${SECTION} = OWNER ]
    then
      export OWNER="${RESULT}"
    elif [ ${SECTION} = GROUP ]
    then
      export GROUP="${RESULT}"
    elif [ ${SECTION} = OTHER ]
    then
      export OTHER="${RESULT}"
    else
      die "Wronk results!" "1"
    fi

    # clear screen
    clear

    return 0

  }

  ################################################################
  # processes results
  ################################################################
  function fResult()
  {
    for SECTION in OWNER GROUP OTHER
    do
      # run function with name
      fAsk "${SECTION}"
    done

    echo "###############################"
    echo
    echo "File permissions are: ${OWNER}${GROUP}${OTHER} "
    echo
    echo "###############################"

    return 0

  }


  ################################################################
  # Shows usage.
  ################################################################
  function fShowUsage()
  {
    echo "Usage: ${SCRIPT_PATH}"
    return 0
  }

  # Start the program:
  fResult "${@}"


  # Exit with previous return code:
  exit "${?}"