#!/usr/bin/env bash

BASE_DIR="$(pwd)"

function get_script_dir {

# resolve links - $0 may be a softlink

PRG="$0"

while [ -h "$PRG" ]; do #-h 文件存在并且是一个字符链接

ls=`ls -ld "$PRG"`

link=`expr "$ls" : '.*-> \(.*\)$'`

if expr "$link" : '/.*' > /dev/null; then

PRG="$link"

else

PRG=`dirname "$PRG"`/"$link"

fi

done

PRGDIR=`dirname "$PRG"`

pushd $PRGDIR &> /dev/null

BASE_DIR=$(pwd)

popd &> /dev/null

}

# get script's directory

get_script_dir