shell文件测试，菜单表示思想

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文件测试表达式
   -f 文件存在且为普通文件
   -d 文件存在且为目录文件
   -s 文件大小不为0则真
   -e 文件存在则真

   -r 文件存且可读 #文件属性对于root有时不好用
   -w 写
   -x 执行
   -L 存在且为链接文件
   f1 -nt f2 f1比f2新则为真
   f1 -ot f2 f1比f2旧则为真
   这些操作符可用于[[]],[],test几乎通用，更多操作符查看man test.

   生产事例：
   prog="rpcbind"
   [ -f /etc/sysconfig/$prog ] && . /etc/sysconfig/$prog #如果存在则加载
   [ -f /etc/sysconfig/$prog ] || exit 1 #不存在退出


   事例2，大括号可执行多个命令
   [ $q -eq 3 ]&&{
   echo 1
   echo 2
   echo 3
   }

判断是否为整数:去掉“非数字”是否等于本身 ["`echo "123a|sed -r 's#[^0-9]##g'`" = "123a"]

#!/bin/sh
               read -p "pls input two num :" num1 num2
               a=num1
               b=num2
               #no.1
               [ $# -ne 2 ]&&{                   #"$#"表示输入的变量个数
                   echo "usage: num1 num2"
                   exit 1
               }
               #no.2
               ["`echo "$a"|sed -r 's#[^0-9]##g'`" = "$a" ]||{
                   echo "first arg must be int"
                   exit 2
               }
               #no.3
               [ $1 -lt $b ]&&{
                   echo "$a<$b"
                   exit 3
               }

企业综合事例：1.当用户输入1时，输出“start install lamp。” 然后执行/server/script/lamp.sh,脚本内容输出 “lamp is install”后退出脚本
              2。当用户输出2时，输出“start install lnmp。” 然后执行/server/script/lnmp.sh,脚本内容输出 “lnmp is install”后退出脚本
              3.当输入3时，退出当前菜单及脚本
              4.当输入任何其他自负，给出提示“input error”后退出脚本
              5.要对执行的脚本进行条件判断，例如：脚本是否存在，是否可执行等。
   打印简单选择菜单示例1，
               cat <<END
                   1.wangfei
                   2.gongli
               END
               read -p "which do you like?:" a
               echo "i guess,you like $a"
   打印简单选择菜单示例2，函数写法，
               menu(){
               cat <<END
                   1.[install lamp]
                   2.[install lnmp]
                   3.[exit]
                   pls input the num you want:
               END
               }
               menu
               read num
               [ "$num" = "1" ]&&{
                   echo "start install lamp."
                   [ -x /server/script/lamp.sh ]||{
                   echo "lamp.sh error"
                   exit 2}
                   . /server/script/lamp.sh
               }
               [ "$num" = "3" ]&&{
                   echo "bye"
                   exit 0
               }
               echo "Iput Error"
               exit 1
   打印多级菜单示例：

cat << EOF
|-----------System Infomation-----------
| DATE       :$DATE
| HOSTNAME   :$HOSTNAME
| USER       :$USER
| IP         :$IPADDR
| DISK_USED :$DISK_SDA
| CPU_AVERAGE:$cpu_uptime
----------------------------------------
|****Please Enter Your Choice:[0-5]****|
----------------------------------------
(1) Configure $SERVER1 Service
(2) Configure $SERVER2 Service
(3) Configure NETWORKE Service
(4) Change Passwd
(5) Logs
(0) Quit
EOF
read -p "Please enter your choice[0-5]: " input
case $input in
#web service
1)
clear
while [ "$flag" -eq 0 ]
do
cat << EOF
----------------------------------------
|****Please Enter Your Choice:[0-3]****|
----------------------------------------
(1) Start $SERVER1 Service
(2) Stop $SERVER1 Service
(3) ReStart $SERVER1 Service
(0) Back
EOF
read -p "Please enter your choice[0-3]: " input1
case $input1 in
1)
echo -e "\n>>>>>>>>>>>$DATE Start $SERVER1">>/log.txt
$SERVER1_START 2>>/log.txt
if [ $? == 0 ];then
   echo "Start $SERVER1......................................................[OK]"
else
   echo "Start $SERVER1......................................................[FAILED]"
fi
sleep 5
clear
;;
2)
echo -e "\n>>>>>>>>>>>$DATE Stop $SERVER1">>/log.txt
$SERVER1_STOP 2>>/log.txt
if [ $? == 0 ];then
   echo "Stop $SERVER1.......................................................[OK]"
else
   echo "Stop $SERVER1.......................................................[FAILED]"
fi
sleep 5
clear
;;
3)
echo -e "\n>>>>>>>>>>>$DATE ReStart $SERVER1">>/log.txt
/usr/local/tdoa/php/sbin/php-fpm restart 2>>/log.txt
$SERVER1_RESTART 2>>/log.txt
if [ $? == 0 ];then
   echo "Restart $SERVER1....................................................[OK]"
else
   echo "Restart $SERVER1....................................................[FAILED]"
fi
sleep 5
clear
;;
0)
clear
break
;;
*) echo "----------------------------------"
    echo "|          Warning!!!            |"
    echo "|   Please Enter Right Choice!   |"
    echo "----------------------------------"

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shell文件测试，菜单表示思想

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