shell 脚本编译安装Nginx，如何判断有没有出错（编译或安装这些）？

Question

这是我的install.sh

#!/bin/sh

# linux上nginx，php，mysql集成环境
# Author salamander

basepath=$(cd `dirname $0`; pwd)

# 1. nginx安装

yum install -y gcc gcc-c++

# pcre安装
tar -zxvf pcre-8.40.tar.gz
cd ./pcre-8.40
./configure --prefix=/usr/local/pcre-8.40
make
make install

cd $basepath

# zlib安装
tar -zxvf zlib-1.2.11.tar.gz
cd ./zlib-1.2.11
./configure --prefix=/usr/local/zlib-1.2.11
make
make install

cd $basepath

# openssl安装，注意openssl是./config
tar -zxvf openssl-1.1.0e.tar.gz
cd ./openssl-1.1.0e
./config  
make
make install

cd $basepath

# nginx安装 注意 --with-pcre=  --with-zlib  指的是源码路径
tar -zxvf nginx-1.10.3.tar.gz
cd ./nginx-1.10.3
./configure --prefix=/usr/local/nginx-1.10.3 --with-pcre=./../pcre-8.40  --with-zlib=./../zlib-1.2.11
make
make install

echo 'Nginx installed successfully!'

最后一句话不管正确错误都会出现，这就不好了，怎么解决呢？

Answer 1

开头加一行 set -e, 如果有命令返回非0则立刻停止

Answer 2

shell里面，如果执行成功返回"0"，执行失败，返回非零数。

echo $?

Answer 3

./configure & make & make install & echo ...

第一个命令执行成功了才会执行第二个，第二个执行成功了才会执行第三个。第三个执行成功了才会执行第四个

Answer 4

# pcre安装
./configure --prefix=/usr/local/pcre-8.40
make && make install || exit

# zlib安装
./configure --prefix=/usr/local/zlib-1.2.11
make && make install || exit

# openssl安装
./config
make && make install || exit

# nginx安装
./configure --prefix=/usr/local/nginx-1.10.3 --with-pcre=./../pcre-8.40  --with-zlib=./../zlib-1.2.11
make && make install

if [[ $? == 0 ]]; then
    echo 'Nginx installed successfully!'
else
    echo 'xxxx'
fi