1.模擬linnux登錄shell

#/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

#/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

#/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(huán)的使用

#/bin/bash
clear
for num in 1 2 3 4 5 6 7 8 9 10
do
??? echo "$num"
done

5.命令行輸入

#/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

#/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(tǒng)大小改為3G

?#/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

#/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

?#/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

#/bin/bash
while read name
do
echo $name
done

11.從0.sh中讀取內容并打印

#/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

#/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

#/bin/bash
p ()
{
??? echo "hello"
}
p

14.給函數傳遞參數

#/bin/bash
p_num ()
{
??? num=$1
??? echo $num
}
for n in $@
do
??? p_num $n
done

15.創(chuàng)建文件夾

#/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

#/bin/bash
ifconfig | grep "inet addr:" | awk '{ print $2 }'| sed 's/addr://g'

17.查找最大文件

#/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

#/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

#/bin/bash
echo "Current User is :"
echo $(ps | grep "$$" | awk '{print $2}')

20.case語句練習

#!/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

#!/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.殺進程

?#/bin/bash
pid=`ps -ef | grep '進程相關內容' | grep -v 'grep' | awk '{ print $2}'`
if [ -n "$pid" ]; then
??????? kill -9 $pid
fi

?23.內置命令的使用

#/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! "

24.

?

?

25.

#/bin/bash

26.打印無密碼用戶

#/bin/bash
echo "No Password User are :"
echo $(cat /etc/shadow | grep "!!" | awk 'BEGIN { FS=":" }{print $1}')

27.

#/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! "

28.檢查端口號是否已啟動
#!/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

總結

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