Shell enterprise interview exercise

problem 1： Use Linux Command query file1 Line number of the blank line

#!/bin/bash
awk '/^$/ {print NR}' file1

problem 2： Documents chengji.txt The contents are as follows ’’
Zhang San 40
Li Si 50
Wang Wu 60
Use Linux Command to calculate the sum of the second column and output .

#!/bin/bash
awk '{sum+=$2} END {print sum}' chengji.txt

problem 3：Shell How to check whether a file exists in the script ？ What to do if it doesn't exist ？

#!/bin/bash
if [ -f file1 ];then
        echo exist
else
        echo not exist
fi   

problem 4： use shell Write a script , Sort an unordered column of numbers in a text

#!/bin/bash
sort -k 2 -nr chengji.txt

problem 5： Please use shell Script out find current folder （/home） All text files below contain characters ”shen” File name for

#1/bin/bash
ls -l /home |grep -r "shen"| awk -F: '{print $1}'

problem 6：
A text file info.txt Is as follows ：
aa,201
zz,502
bb,1
ee,42
Each line is separated by commas , The second column is all numbers , Please arrange the file in the second column from the largest to the smallest .

#!/bin/bash
sort -t',' -k 2 -nr info.txt

problem 7： Write scripts to achieve the following functions ;
Every day in the morning 5 Start backup at
What to back up is /var/mylog All files and directories in the can be compressed for backup
Backup can be saved to another device 192.168.1.2 FTP Account number aaa password bbb
Daily backup files are required to be marked with the date of the day

#!/bin/bash
date=`date +%F`
tar -zvcf  backup-{
    $date}.bak /var/mylog/
if [ -f backup-{
    $date}.bak ];then
        echo success
        ftp -i -n 192.168.1.2 <<- eof
        user aaa bbb
        put backup-{
    $date}.bak
        bye
        eof
else
        echo failed
fi
vim /etc/crontab
* 5 * * * /bin/bash /shell/d4/7.sh

problem 8： Please use shell The script creates a group class、 A group of users , The user is called stdX,X from 01-30, And attribution class Group

#!/bin/bash
groupadd class
for i in {
    1..30}
do
        if [ $i -le 10 ];then
                useradd std0$i -g class
        else
                useradd std$i -g class
        fi
done

problem 9：## Process the following documents , Take out the domain name and count it , Such as handling :
http://www.baidu.com/more/
http://www.baidu.com/guding/more.html
http://www.baidu.com/events/20060105/photomore.html
http://hi.baidu.com/browse/
http://www.sina.com.cn/head/www20021123am.shtml
http://www.sina.com.cn/head/www20041223am.shtml

#!/bin/bash
awk -F/ '{print $3}' a.txt| sort | uniq -c |sort -n

problem 10、 Write a script to find the last creation time is 3 Days ago, , Suffix is *.log And delete .**

#!/bin/bash
find / -name "*.log" -ctime +3 | xargs rm -f

problem 11、 Write a script to make a directory larger than 100k Move your file to /tmp Next .

#!/bin/bash
for i in `find /shell -type f -size +100k`
do
        cd /shell && mv $i /tmp
done

problem 12、 Write a script for nginx Log statistics , Get access to ip Most of the former 10 individual (nginx Log path
path ：/home/logs/nginx/default/access.log

#!/bin/bash
awk '{print $1}' /home/logs/nginx/default/access.log | sort | uniq -c | sort -nr | head -n 10

problem 13、 Write a script to put... In the specified file /usr/local Replace it with another directory .

#!/bin/bash
sed 's#/usr/local#/usr#g' test.txt

problem 14、 Instructions ：ls | grep “[ad]*.conf” The correct explanation of the command is ：
Display contains a perhaps d Start with , Followed by any character , Is then followed by .conf Character file （ Or directory ）

2、 find IO The redirection execution result is different from the other three ：
right key : C
A ./run.sh >run.log 2>&1;
B ./run.sh 2>&1 >run.log;
C ./run.sh &>run.log;
D ./run.sh 2>run.log >&2
3、 A file , Probably 1 Billion rows , Each row of a ip, Will appear the most top10 Output to a new file

 sort file | uniq -c | sort -nr | head -n 10 >> file2