Get this Script's own Absolute Directory Path (Using `readlink -f` Command).

get_own_path.sh

#!/bin/sh

mypath=`readlink -f $0`
mydir=`dirname $mypath`

echo $mypath
echo $mydir

get_own_path_gnu_readlink.sh

#!/bin/sh

TARGET_FILE=$1

while [ "$TARGET_FILE" != "" ]; do
    cd `dirname $TARGET_FILE`
    FILENAME=`basename $TARGET_FILE`
    TARGET_FILE=`readlink $FILENAME`
done

echo `pwd -P`/$FILENAME