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 )"