前几天写的七牛的参赛demo，用bash写了一个便捷安装的脚本，涉及到了路径相关的判断，从stackoverflow，加上自己的实践整理一下。

简单版

下面是一个最简单的实现，可以解决大多数问题，缺陷是对于软链接显示的是软链接所在的目录

lineos:false

#!/bin/bash

DIR="$( cd "$( dirname "$0"  )" && pwd  )"

完善版

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

lineos:false

#!/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  )"