Linux shell命令學習筆記(一)

擷取伺服器IP的Shell 指令碼：

代碼如下	複製代碼
#!/bin/bash ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' |cut -d: -f2 | awk '{ print $1}'

下載整站

wget -mk http://www.111cn.net

判斷檔案的存在與否

 

代碼如下	複製代碼
#!/bin/bash if [ ! -f /root/log.l ]    then echo "log.l note exist" fi

常用文法

while 語句

 

代碼如下	複製代碼
#!/bin/bash echo "enter passwd" read passwd while [ $passwd != "iterse" ];do         echo "sorry try again"         read passwd done

for 語句

 

代碼如下	複製代碼
#! /bin/bash for i in a b c; do         echo "$in" done

case 語句

代碼如下	複製代碼
#! /bin/sh echo "Enter a number" read number case $number in         1)         echo "you number is 1"         ;;         2)         echo "yo number is 2"         ;;         *)         exit 1         ;; esac

if else elif fi

代碼如下	複製代碼
#! /bin/sh echo "Is it morning? Please answer yes or no." read YES_OR_NO if [ "$YES_OR_NO" = "yes" ]; then   echo "Good morning!" elif [ "$YES_OR_NO" = "no" ]; then   echo "Good afternoon!" else   echo "Sorry, $YES_OR_NO not recognized. Enter yes or no."   exit 1 fi exit 0