Command in bash shell script to find path to that script?

See the answers on Get the source directory of a Bash script from within the script itself. The accepted one recommends

#!/bin/bash

DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"

but reading all the answers gives a lot of alternatives (and insights into how shells work).

The answers here do not always contain best practices, so if you just want the directory echoed on the screen (even when it contains spaces):

#!/bin/bash
echo "My Script is being run from here: $(dirname "$0")"

If you want it into a variable and want . expanded to the full path, you need GNU Readlink first so:

1. Install homebrew

2. Install GNU CoreUtils:

   brew install coreutils
   

3. Use the following script:

   #!/bin/bash
   
   szMyPath=$(dirname "$0")
   
   if [[ $szMyPath =~ ^. ]]; then 
     szMyPath="$(dirname "$(greadlink -f "$0")")" 
   fi
   
   echo "$szMyPath"