该脚本中运用到工作中常用的shell语法，琐碎的语法结合起来可以帮助处理工作，解放人力。

主要常用的shell知识点：

1. 判断参数是否存在和判断参数个数

2. 声明函数

3. 判断字符串相等

4. 判断字符串包含

5. 判断数组内容和数组个数，并循环数组

6. if多条件语法

7. sed 
   

记录该脚本，是为了记录一些基础语法，未来忘了可以翻阅。 把基础的语法运用得当，更好的协助运维的工作。脚本只适用一些特殊需求。

#!/bin/bash

# 2017/1/11

#适用添加m站点的脚本。 将域名 改变成目录代理的方式。 

LIST=`echo "$1" | cut -d. -f1`

LISTER=`echo "$1" | cut -d. -f2`

oldnip=`echo "$3" | sed ‘s/\// /g‘`

nip=($oldnip)

PORT="$2"

HOST=$(hostname)

#判断是否在nginx服务器主机上执行，并由于目录不一致，而声明了两个不同变量

if [ $HOST = "tnginx101" ];then

ROUTE="/app/nginx"

elif [ $HOST = "tnginx102" ];then

ROUTE="/usr/local/nginx"

else

echo "$HOST not nginx proxy"

exit 2

fi

DIRECTORY="/app/shell/mtemplate/msite"

TEMPLATE="/app/shell/mtemplate"

MPROXY="$ROUTE/conf/Directory"

#判断参数个数是否正确

if [ -z $1 ] && [ -z $2 ] && [ -z $3 ];then

echo "Please input three arguments"

echo "Usage: $basename$0 content.m.mallcoo.cn 9001 web101/web102"

exit 2

fi

if [ $# -ne 3 ];then

echo "input arguments error"

exit 2

fi

if [ ! -d $MPROXY ];then

echo "not exist $MPROXY"

exit 3

fi

if [ ! -d $DIRECTORY ] ;then

echo "not exist "$DIRECTORY""

exit 2

fi

upstream_http(){

if [ $LISTER = "m" ];then

cat $TEMPLATE/upstream_template > $DIRECTORY/Server-Port.conf

sed -i ‘s/template_template_http/‘$LIST‘_m_http/g‘ $DIRECTORY/Server-Port.conf

if [ ${#nip[@]} -gt 1 ];then

        for i in ${nip[*]};do

                sed -i ‘/upstream/a\    server ‘$i‘:‘$PORT‘ weight=2 max_fails=2 fail_timeout=30s;‘ $DIRECTORY/Server-Port.conf

        done

elif [ ${#nip[@]} -eq 1 ];then

sed -i ‘/upstream/a\    server ‘$nip‘:‘$PORT‘ weight=2 max_fails=2 fail_timeout=30s;‘ $DIRECTORY/Server-Port.conf

else

echo "please confirm it "

exit 2

fi

cat $DIRECTORY/Server-Port.conf >> $MPROXY/Server-Port.conf

fi

#匹配域名 第二节 包含api的字符。如content.api.mallcoo.cn 

if [[ $LISTER =~ "api" ]];then

cat $TEMPLATE/upstream_template > $DIRECTORY/Server-Port.conf

sed -i ‘s/template_template_http/‘$LIST‘_api_http/g‘ $DIRECTORY/Server-Port.conf

if [ ${#nip[@]} -gt 1 ];then

        for i in ${nip[*]};do

                sed -i ‘/upstream/a\    server ‘$i‘:‘$PORT‘ weight=2 max_fails=2 fail_timeout=30s;‘ $DIRECTORY/Server-Port.conf

        done

elif [ ${#nip[@]} -eq 1 ];then

sed -i ‘/upstream/a\    server ‘$nip‘:‘$PORT‘ weight=2 max_fails=2 fail_timeout=30s;‘ $DIRECTORY/Server-Port.conf

else

echo "please confirm it "

exit 2

fi

cat $DIRECTORY/Server-Port.conf >> $MPROXY/Server-Port.conf

fi

}

#追加 location_http

location_http(){

if [ $LISTER = "m" ];then

cat $TEMPLATE/location_template > $DIRECTORY/Http.conf

sed -i ‘s/mould\/mould/a\/‘$LIST‘/g‘ $DIRECTORY/Http.conf

sed -i ‘s/template_template_http/‘$LIST‘_m_http/g‘ $DIRECTORY/Http.conf

cat $DIRECTORY/Http.conf >> $MPROXY/Http.conf

fi

if [[ $LISTER =~ "api" ]];then

cat $TEMPLATE/location_template > $DIRECTORY/Http.conf

        sed -i ‘s/mould\/mould/api\/‘$LIST‘/g‘ $DIRECTORY/Http.conf

        sed -i ‘s/template_template_http/‘$LIST‘_api_http/g‘ $DIRECTORY/Http.conf

cat $DIRECTORY/Http.conf >> $MPROXY/Http.conf

fi

}

upstream_http

location_http

本文出自 “濛sir的积累” 博客，请务必保留此出处http://mengsir.blog.51cto.com/2992083/1891151

shell——记录个人脚本的一个进阶