获得脚本所在文件的路径

运行如下脚本可以获得脚本所在的文件夹的路径，如果脚本为软链接，则获得实际文件所在的文件夹路径。

#!/bin/bash
SOURCE=${BASH_SOURCE[0]}
while [ -h $SOURCE ]; do # resolve $SOURCE until the file is no longer a symlink
  DIR=$( cd -P $( dirname $SOURCE ) && pwd )
  SOURCE=$(readlink $SOURCE)
  [[ $SOURCE != /* ]] && SOURCE=$DIR/$SOURCE # if $SOURCE was a relative symlink, we need to resolve it relative to the path where the symlink file was located
done
DIR=$( cd -P $( dirname $SOURCE ) && pwd )
echo $DIR