簡單的shell指令碼執行個體

1.類比linnux登入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.尋找/root/目錄下是否存在該檔案

#/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迴圈的使用

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

5.命令列輸入

#/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.刪除目前的目錄下大小為0的檔案

#/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下有檔案，那麼將其檔案系統大小改為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的大小大於0，那麼將/opt目錄下的*.tar.gz檔案

 #/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.列印讀取的內容，為下面的例子做準備

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

11.從0.sh中讀取內容並列印

#/bin/bash
while read line
do
    echo $line
done < 0.sh

12.讀取a.c中的內容並做加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.建立檔案夾

#/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.擷取本機IP地址

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

17.尋找最大檔案

#/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.尋找當前網段內IP使用者，重新導向到ip.txt檔案中

#/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.列印目前使用者

#/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.內建命令的使用

#/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.列印無密碼使用者

#/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.檢查連接埠號碼是否已啟動
#!/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