shell指令碼面試題
1:開發Shell指令碼判斷系統根分割槽剩餘空間的大小,如果低於1000MB就提示不足,否則提示充足。
#!/bin/bash m=`df -m | awk '{print $4}' | sed -n 2p` if [ $m -gt 1000 ] ; then echo "充足" else echo "不足" fi
2:分別使用變數定義、read讀入及指令碼傳參方式實現比較2個整數的大小。
#!/bin/bash read -p "請輸入兩個數:" num1 num2 a=$num1 b=$num2 if [ "echo "$a" | sed -r 's/[^0-9]//g'"="$a" ];then if [ "echo "$b" | sed -r 's/[^0-9]//g'"="$a" ];then if [ $a -eq $b ];then echo "兩個數一般大" elif [ $a -gt $b ];then echo "第一個數比第二個數大" else echo "第二個數比第一個數大" fi else echo "第二個數不是整數" fi else echo "第一個數不是整數" fi
3:列印一個選單如下,當用戶選擇對應的數字時,就執行對應項的應用,最好對使用者的輸入進行是否為整數判斷。
1.install lamp 2.install lnmp 3.exit #!/bin/bash # Author: Peter zh # Blog: https://www.cnblogs.com/zhangwduoduoj/ # Time: 2019-08-24 17:45:43 # Name: install.sh # Version: v1.0 # Description: This is a Script. cat << EOF 1.install lamp 2.install lnmp 3.exit EOF read -p "please input choice" a if [ -n "$(echo $a| sed -n "/^[0-9]\+$/p")" ];then echo "please input num" fi if [ $a -eq 1 ];then yum install httpd mysql php -y elif [ $a -eq 2 ];then yum install nginx mysql php -y elif [ $a -eq 3 ];then exit 0 fi
4:通過指令碼傳參的方式,檢查Web網站URL是否正常(要求主體使用函式)。
####可以使用curl 命令取狀態嗎 與wget同理
curl -I -m 10 -o /dev/null -s -w %{http_code} www.baidu.com
#!/bin/bash # Author: Peter zh # Blog: https://www.cnblogs.com/zhangwduoduoj/ # Time: 2019-08-24 14:31:53 # Name: url.sh # Version: v1.0 # Description: This is a Script. function_url(){ wget --spider -T 5 -q -t 2 $1 if [ $? -eq 0 ];then echo 'OK!' else echo 'error..' fi } function_url $1
5:利用case語句開發Rsync服務啟動停止指令碼,並能通過chkconfig實現開機自啟動。
1 #!/bin/bash 2 # Author: Peter zh 3 # Blog: https://www.cnblogs.com/zhangwduoduoj/ 4 # Time: 2019-08-24 14:35:58 5 # Name: rsync.sh 6 # Version: v1.0 7 # Description: This is a Script. 8 chkconfig rpcbind on 9 chkconfig rsync on 10 function_start(){ 11 rsync --daemon 12 if [ $? -eq 0 ] 13 then 14 echo 'rsync is start' 15 else 16 echo 'error..' 17 fi 18 } 19 function_stop(){ 20 pkill rsync 21 if [ $? -eq 0 ] 22 then 23 echo 'rsync is stop' 24 else 25 echo 'errorrr..' 26 fi 27 } 28 function_restart(){ 29 function_start 30 function_stop 31 } 32 case $1 in 33 start) 34 function_start 35 ;; 36 stop) 37 function_stop 38 ;; 39 restart) 40 function_restart 41 ;; 42 *) 43 echo "Usage:start|stop|restart" 44 ;; 45 esac
6:猜數字遊戲。首先讓系統隨機生成一個數字,給這個數字定一個範圍(1-60),讓使用者輸入猜的數字,對輸入進行判斷,如果不符合要求,就給予高或低的提示,猜對後則給出猜對用的次數,請用while語句實現。
#!/bin/bash # Author: Peter zh # Blog: https://www.cnblogs.com/zhangwduoduoj/ # Time: 2019-08-24 17:11:05 # Name: random.sh # Version: v1.0 # Description: This is a Script. sum1=0 sum2=0 number_range=$((RANDOM%60)) while : do read -p "please input intger>> " num if [[ $num == "quit" ]];then exit 0 fi #echo $number_range if [ $num -lt $number_range ] then echo "little" let sum1++ elif [ $num -gt $number_range ];then echo 'big' let sum2++ elif [ $num -eq $number_range ];then echo "all guess $((sum1+sum2+1))" fi done
7:分析nginx訪問日誌(自備),把日誌中每行的訪問位元組數對應欄位數字相加,計算出總的訪問量。給出實現程式,請用while迴圈實現。
#!/bin/bash # Author: Peter zh # Blog: https://www.cnblogs.com/zhangwduoduoj/ # Time: 2019-08-24 15:06:04 # Name: nginxlog.sh # Version: v1.0 # Description: This is a Script. sum=0 exec < /application/nginx/logs/access.log while read line do b=`echo "$line" | awk '{print $10}'` if [ $? -eq 0 ]; then sum=$(($sum+$b)) fi done echo $sum
8:計算從1加到100之和(要求用for和while,至少給出兩種方法)。
#!/bin/bash sum=0 for i in {1..100} do let sum+=i done echo `seq -s "+" 100`"="$sum
9:利用bash for迴圈列印下面這句話中字母數不大於6的單詞(某企業面試真題)。I am zzz teacher welcome to zzzzzz training class
#!/bin/bash # Author: Peter zh # Blog: https://www.cnblogs.com/zhangwduoduoj/ # Time: 2019-08-24 15:11:52 # Name: 6.sh # Version: v1.0 # Description: This is a Script. a="I am zzz teacher welcome to zzzzzz training class" b=`echo $a |tr " " "\n"` for i in $b do if [[ `echo $i|wc -L` < 6 ]];then echo $i fi done
提示:判斷字串長度的方法
1.wc -L
2.echo $(expr length $變數名)
3.echo ${#變數名}
10:使用read讀入方式比較兩個整數大小,要求對使用者輸入的內容嚴格判斷是否為整數,是否輸入了兩個數字。
#!/bin/bash # Author: Peter zh # Blog: https://www.cnblogs.com/zhangwduoduoj/ # Time: 2019-08-24 17:24:21 # Name: bijiao.sh # Version: v1.0 # Description: This is a Script. read -p "first:" a read -p "second:" b if [[ -z $a || -z $b ]];then echo "please input num---" exit 1 fi if [[ -n "$(echo $a| sed -n "/^[0-9]\+$/p")" && -n "$(echo $b| sed -n "/^[0-9]\+$/p")" ]];then if [ $a -lt $b ];then echo "big----small" $b $a elif [ $a -gt $b ];then echo "big----small" $a $b else echo 'same num' fi else echo "dont want abcd!#%^&...." fi
11.關閉chkconfig命令中所有第5階段下的程式,全都寫成off
#!/bin/bash # Author: Peter zh # Blog: https://www.cnblogs.com/zhangwduoduoj/ # Time: 2019-08-21 11:08:30 # Name: chkconfig.sh # Version: v1.0 # Description: This is a Script. chk=`chkconfig --list|awk '{print $1}'` for i in $chk do judge=`chkconfig $i --list |awk '{print $7}'|cut -d: -f2` if [[ $judge == "off" ]];then echo "$i dont need off ,already off" else chkconfig --level 5 $i off fi done