Getting the full path to current script in bash

bash-script-path.sh

#!/bin/bash

# All these options work on bash 3.2 on macOS where 'readlink -f' is not available

# Ref http://stackoverflow.com/a/246128

# 1. Get script path, don't canonicalise symlinks used in script path

# ${BASH_SOURCE[0]} is set but includes './' prefix
DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" 2>/dev/null)" && pwd 2>/dev/null)"
SCRIPT_PATH=$DIR/$(basename $0)
echo $DIR
echo $SCRIPT_PATH
exit 0


# 2. Canonicalise symlinks - option 1
SCRIPT_PATH="${BASH_SOURCE[0]}";
if ([ -h "${SCRIPT_PATH}" ]) then
  while([ -h "${SCRIPT_PATH}" ]) do SCRIPT_PATH=`readlink "${SCRIPT_PATH}"`; done
fi
pushd . > /dev/null
cd `dirname ${SCRIPT_PATH}` > /dev/null
SCRIPT_PATH=`pwd`;
echo $SCRIPT_PATH
popd  > /dev/null
exit 0



# 3. Canonicalise symlinks - option 2
SOURCE="${BASH_SOURCE[0]}"
# SOURCE="$0"
while [ -h "$SOURCE" ]; do # resolve $SOURCE until the file is no longer a symlink
  TARGET="$(readlink "$SOURCE")"
  if [[ $TARGET == /* ]]; then
    echo "SOURCE '$SOURCE' is an absolute symlink to '$TARGET'"
    SOURCE="$TARGET"
  else
    DIR="$( dirname "$SOURCE" )"
    echo "SOURCE '$SOURCE' is a relative symlink to '$TARGET' (relative to '$DIR')"
    SOURCE="$DIR/$TARGET" # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
  fi
done
echo $SOURCE