Here is the best answer I think. It solves a lot of problems not solved in the other answers, namely:

1. realpath can find the absolute path from a relative path, and will expand symbolic links (use realpath -s instead to NOT expand symbolic links)
2. "${BASH_SOURCE[-1]}" is cleaner and shorter than "${BASH_SOURCE[${#BASH_SOURCE[@]} - 1]}", and allows this to work whether the script is run OR sourced, and even if the script being called gets called from within another bash function.
3. I also demonstrate obtaining the script directory and filename, as shown below.

FULL_PATH_TO_SCRIPT="$(realpath "${BASH_SOURCE[-1]}")" # OR, use `-s` to NOT expand symlinks: # FULL_PATH_TO_SCRIPT_KEEP_SYMLINKS="$(realpath -s "${BASH_SOURCE[-1]}")" SCRIPT_DIRECTORY="$(dirname "$FULL_PATH_TO_SCRIPT")" SCRIPT_FILENAME="$(basename "$FULL_PATH_TO_SCRIPT")" # Now print it all out echo "FULL_PATH_TO_SCRIPT = \"$FULL_PATH_TO_SCRIPT\"" echo "SCRIPT_DIRECTORY = \"$SCRIPT_DIRECTORY\"" echo "SCRIPT_FILENAME = \"$SCRIPT_FILENAME\"" 

For a lot more details on this, see my main answer on this in the first reference link just below.

References:

1. My main answer on this: Stack Overflow: How can I get the source directory of a Bash script from within the script itself?
2. How to retrieve absolute path given relative
3. taught me about the BASH_SOURCE variable: Unix & Linux: determining path to sourced shell script
4. taught me that BASH_SOURCE is actually an array, and we want the last element from it for it to work as expected inside a function (hence why I used "${BASH_SOURCE[-1]}" in my code here): Unix & Linux: determining path to sourced shell script
5. man bash --> search for BASH_SOURCE:

   BASH_SOURCE

   An array variable whose members are the source filenames where the corresponding shell function names in the FUNCNAME array variable are defined. The shell function ${FUNCNAME[$i]} is defined in the file ${BASH_SOURCE[$i]} and called from ${BASH_SOURCE[$i+1]}.