How to block shell script from being called elsewhere other than the folder it is on?

Question

I would like to halt my shell script if the user is currently not the shell script directory. For example, I am on the folder ~/ and call the shell script ~/shell/script.sh, the shell script should print You are not allowed to call this shell script from another folder other than its directory. But if I am on the folder ~/shell and call ./script.sh than the execution is allowed.

Why do you care what the $PWD is? You can change directories in the script if it matters: cd "$(dirname "0ドル")"

It is a very local aggressive/dangerous script, so I would like the user to be present on the folder paying more attention on it when it is running the script.

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Related questions:

1. Check if bash script was invoked from a shell or another script/application
2. Executable lauches if called directly from terminal, but does not work when called from shell script

• grawity: Your own question already answers this in the 2nd paragraph – you can compare $PWD.
• Cyrus: Second paragraph is a comment from this deleted question.
• Cyrus: See: Getting the source directory of a Bash script from within
• glenn jackman: Why don't you just have the script change directory to its own directory? Then it doesn't matter where you call it from: cd "$(dirname "$(realpath "0ドル")")"
• user: Because I need to ensure the 0ドル contains the current file file on the form ./shell.sh, as later on the shell script, I am using find . to list the files on the current folder and with "$path" != "0ドル" is how I choose to exclude the own shell script from this processing list I am applying sed .

Answer 1

You can get the full path to your executing script by using realpath to resolve the implicit current directory (man realpath for details, the -P option can be useful):

mydir=$(dirname $(realpath 0ドル))
[[ $PWD != $mydir ]] && { echo "Not in the right directory!"; exit 1; }
echo "OK, proceed..."

Answer 2

Thanks @grawity, I wrote this:

# Call the main function, as when running from the command line the `0ドル` variable is 
# not empty.
#
# Importing functions from a shell script
# https://stackoverflow.com/questions/12815774/importing-functions-from-a-shell-script
if ! [[ -z "0ドル" ]]
then
 # Reliable way for a bash script to get the full path to itself?
 # http://stackoverflow.com/questions/4774054/reliable-way-for-a-bash-script-to-get
 pushd `dirname 0ドル` > /dev/null
 SCRIPT_FOLDER_PATH=`pwd`
 popd > /dev/null
 if[[ "$SCRIPT_FOLDER_PATH" == "$(pwd)" || "$SCRIPT_FOLDER_PATH" == "$(dirname "0ドル")" ]]
 then
 main "$@"
 else
 printf "You cannot run this from the folder: \n'$(pwd)'\n"
 printf "\nPlease, run this script from its folder on: \n'$SCRIPT_FOLDER_PATH'\n"
 fi
fi