获取shell脚本自身所在目录

解决了使用ln -s target linkName创造软链接无法正确取到真实脚本的问题。

#!/bin/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

参考：

https://www.jb51.net/article/59949.htm