#!/bin/bash

 this shell will be installed jdk*.tar.gz
author: wangjiulong
ROOT=$(pwd)
SCRIPTS=$ROOT/scripts
PKGS=$ROOT/pkgs
NGINX_ROOT=/usr/local/nginx
服務器如果已經安裝了nginx，那么就不重新安裝;沒有，就安裝.
nginx_path=/usr/local/nginx
檢查要安裝的nginx版本，記錄保存
nginx_pkg=cat $tmp_nginx_pkgtar
cat $tmp_nginx_pkgtar | awk -F.tar.gz '{print $1}' | awk -F- '{print $2}' > $tmp_nginx_pkgtar_version 2>&1
nginx_tar=cat $tmp_nginx_pkgtar | awk -F.tar.gz '{print $1}'
nginx_tar_version=cat $tmp_nginx_pkgtar_version
檢查本機中的nginx版本，記錄保存
nginx_local=$nginx_path/sbin/nginx -v > $tmp_nginx_local  2>&1
cat $tmp_nginx_local | awk -F[\/] '{print $2}' > $tmp_nginx_local_version 2>&1
nginx_local_version=cat $tmp_nginx_local_version
datef() {
        date "+%Y/%m/%d %H:%M";
}
custom log
print_log(){
        if [[ -d $log_dir  ]];then
                echo "[$(datef)]  $1" >> $log
        else
                echo "[$(datef)] log path does not exist,created first" >>$log
                mkdir -p $log_dir
                echo "[$(datef)]  $1" >> $log
        fi
}
檢查nginx是否安裝  
Check whether the installation nginx
check_nginx(){
        diff_value=diff $tmp_nginx_local_version $tmp_nginx_pkgtar_version ;echo $?
        nginx_value=ls $nginx_path > /dev/null 2>&1 ;echo $?
        case $nginx_value in
                0)
                case $diff_value in
                        0)
                                print_log "本機已經安裝了nginx，nginx的版本是$nginx_local_version,程序即將退出。"
                                exit
                        ;;
                        1)
                                print_log "本機已經安裝了nginx，但與要安裝的nginx的版本不一致。"
                                exit
                        ;;
                        *)
                                print_log "程序存在異常，即將退出。異常可能是因為不存在文件/目錄導致的，請檢查!!!"
                        ;;
                esac
                        print_log "本機已經安裝了nginx，nginx的版本是$nginx_local_version,程序即將退出。"
                        exit
                ;;
                *)
                        print_log "本機不存在nginx目錄，程序即將安裝nginx，nginx版本是$nginx_tar_version"
                        install_nginx
                ;;
        esac
}
install nginx
install_nginx(){
        cd $tar_dir
        tar -zxf $nginx_pkg
        cd $nginx_tar
        ./configure --prefix=/usr/local/nginx --with-http_ssl_module  --with-http_sub_module --with-http_gzip_static_module --with-http_stub_status_module --with-pcre --without-select_module --without-poll_module && make && make install
        if [[ $? != "0" ]];then
                print_log "[$(datef)] install_nginx(): install error!"
                exit
        fi
        cp -fv $file_dir/nginx /etc/init.d/nginx
        cp -fv $file_dir/nginx.conf $nginx_path/conf/
        chkconfig --add nginx
        add_user
        #Test config file exits
}
add_user(){
        print_log "**begin change www user mode ** "
        if ! grep "^www" /etc/passwd
        then
                groupadd www
                useradd -g www -d /data/www www
        fi
        print_log "**end changed *** "
        finished
}
finished(){
        #install complete
        print_log "+++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
        print_log "+ [$(datef)] congratulagions!++++++++++++++++++++++++++++"
        print_log "+ [$(datef)] don't forget to modify configuration files++"
        print_log "+ [$(datef)] based on your system resources like mem size"
        print_log "+++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
}
print_log "執行check_nginx函數，開始準備安裝nginx"
check_nginx</pre>
 哎、、、nginx的腳本，我個人覺得寫的不是很好。邏輯上不是很順。只有待后面再重新改過了。