常用的shell语句

判断软件是否安装

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#!/bin/bash

if [ ! -x "$(command -v xcodeproj)" ]; then 
    echo "xcodeproj is not installed. installing..." > &2
    echo "run 'gem install xcodeproj'"
    gem install xcodeproj
fi

当前shell脚本所在目录

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SCRIPT_DIR="$(cd "$(dirname "$0")"; pwd)";