自己寫了一下小的shell實例，雖然很小，但所有的大的程序都是由小的模塊堆積起來的，程序員一定要懂得一種腳本的書寫，而我，只會在linux下工作，所以就只能寫linux的shell腳本了，呵呵，本文會陸續更新，給自己加油！
1.模擬linnux登錄shell
復制代碼 代碼如下:
#/bin/bash
echo -n "login:"
read name
echo -n "password:"
read passwd
if [ $name = "cht" -a $passwd = "abc" ];then
echo "the host and password is right!"
else echo "input is error!"
fi
2.比較兩個數大小
復制代碼 代碼如下:
#/bin/bash
echo "please enter two number"
read a
read b
if test $a -eq $b
then echo "NO.1 = NO.2"
elif test $a -gt $b
then echo "NO.1 > NO.2"
else echo "NO.1 NO.2"
fi
3.查找/root/目錄下是否存在該文件
復制代碼 代碼如下:
#/bin/bash
echo "enter a file name:"
read a
if test -e /root/$a
then echo "the file is exist!"
else echo "the file is not exist!"
fi
4.for循環的使用
復制代碼 代碼如下:
#/bin/bash
clear
for num in 1 2 3 4 5 6 7 8 9 10
do
echo "$num"
done
5.
復制代碼 代碼如下:
#/bin/bash
echo "Please enter a user:"
read a
b=$(whoami)
if test $a = $b
then echo "the user is running."
else echo "the user is not running."
fi
6.刪除當前目錄下大小為0的文件
復制代碼 代碼如下:
#/bin/bash
for filename in `ls`
do
if test -d $filename
then b=0
else
a=$(ls -l $filename | awk '{ print $5 }')
if test $a -eq 0
then rm $filename
fi
fi
done
7.如果/export/um_lpp_source下有文件，那么將其文件系統大小改為3G
復制代碼 代碼如下:
#/bin/bash
while line=`ls /export/um_lpp_source`
do
if test $line=""
then echo "NULL"
sleep 1
else echo $line
chfs -a size=3G /export/um_lpp_source
exit 0
fi
done
8.測試IP地址
復制代碼 代碼如下:
#/bin/bash
for i in 1 2 3 4 5 6 7 8 9
do
echo "the number of $i computer is "
ping -c 1 192.168.0.$i
done
9.如果test.log的大小大于0，那么將/opt目錄下的*.tar.gz文件
復制代碼 代碼如下:
#/bin/sh
a=2
while name="test.log"
do
sleep 1
b=$(ls -l $name | awk '{print $5}')
if test $b -ge $a
#then echo "OK"
then `cp /opt/*.tar.gz .`
exit 0
fi
done
10.打印讀取的內容，為下面的例子做準備
復制代碼 代碼如下:
#/bin/bash
while read name
do
echo $name
done
11.從0.sh中讀取內容并打印
復制代碼 代碼如下:
#/bin/bash
while read line
do
echo $line
done 0.sh
12.讀取a.c中的內容并做加1運算
復制代碼 代碼如下:
#/bin/bash
test -e a.c
while read line
do
a=$(($line+1))
done a.c
echo $a
13.普通無參數函數
復制代碼 代碼如下:
#/bin/bash
p ()
{
echo "hello"
}
p
14.給函數傳遞參數
復制代碼 代碼如下:
#/bin/bash
p_num ()
{
num=$1
echo $num
}
for n in $@
do
p_num $n
done
15.創建文件夾
復制代碼 代碼如下:
#/bin/bash
while :
do
echo "please input file's name:"
read a
if test -e /root/$a
then
echo "the file is existing Please input new file name:"
else
mkdir $a
echo "you aye sussesful!"
break
fi
done
16.獲取本機IP地址
復制代碼 代碼如下:
#/bin/bash
ifconfig | grep "inet addr:" | awk '{ print $2 }'| sed 's/addr://g'
17.查找最大文件
復制代碼 代碼如下:
#/bin/bash
a=0
for name in *.*
do
b=$(ls -l $name | awk '{print $5}')
if test $b -ge $a
then a=$b
namemax=$name
fi
done
echo "the max file is $namemax"
18.查找當前網段內IP用戶，重定向到ip.txt文件中
復制代碼 代碼如下:
#/bin/bash
a=1
while :
do
a=$(($a+1))
if test $a -gt 255
then break
else
echo $(ping -c 1 192.168.0.$a | grep "ttl" | awk '{print $4}'| sed 's/://g')
ip=$(ping -c 1 192.168.0.$a | grep "ttl" | awk '{print $4}'| sed 's/://g')
echo $ip >> ip.txt
fi
done
19.打印當前用戶
復制代碼 代碼如下:
#/bin/bash
echo "Current User is :"
echo $(ps | grep "$$" | awk '{print $2}')
20.case語句練習
復制代碼 代碼如下:
#!/bin/bash
clear
echo "enter a number from 1 to 5:"
read num
case $num in
1) echo "you enter 1"
;;
2) echo "you enter 2"
;;
3) echo "you enter 3"
;;
4) echo "you enter 4"
;;
5) echo "you enter 5"
;;
*) echo "error"
;;
esac
21.yes/no返回不同的結構
復制代碼 代碼如下:
#!/bin/bash
clear
echo "enter [y/n]:"
read a
case $a in
y|Y|Yes|YES) echo "you enter $a"
;;
n|N|NO|no) echo "you enter $a"
;;
*) echo "error"
;;
esac
22.內置命令的使用
復制代碼 代碼如下:
#/bin/bash
clear
echo "Hello, $USER"
echo
echo "Today 's date id `date`"
echo
echo "the user is :"
who
echo
echo "this is `uname -s`"
echo
echo "that's all folks! "
23.打印無密碼用戶
復制代碼 代碼如下:
#/bin/bash
echo "No Password User are :"
echo $(cat /etc/shadow | grep "!!" | awk 'BEGIN { FS=":" }{print $1}')
24.
復制代碼 代碼如下:
#/bin/bash
clear
echo "Hello, $USER"
echo
echo "Today 's date id `date`"
echo
echo "the user is :"
who
echo
echo "this is `uname -s`"
echo
echo "that's all folks! "
25.檢查端口號是否已啟動
復制代碼 代碼如下:
#!/bin/bash
n=1
echo "檢查xxx服務..."
while true
do
if test $n -gt 20
then
echo "xxx服務啟動失敗"
break
fi
sleep 5
n=$(($n+1))
port=`netstat -antp | grep "0.0.0.0:8080"`
if [ ${#port} -gt 3 ]; then
echo "xxx服務已經啟動"
break;
fi
done
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