Shulou(Shulou.com)06/03 Report--

This article mainly explains "what are the common commands of Shell scripts that are easy to use". The explanation in this article is simple and clear, easy to learn and understand. Please follow the ideas of Xiaobian and go deep into it slowly to study and learn "what are the common commands of Shell scripts that are easy to use" together!

1. List all catalog usage and sort by size.

The code is as follows:

ls|xargs du -h|sort -rn

#Do not recursively use du -sh for child directories

2. View files exclude #switches and blank lines for viewing profiles.

The code is as follows:

egrep -v "^#|^$" filename

sed '/#.*$/ d; /^ *$/d'

3. Delete spaces and blank lines.

The code is as follows:

sed '/^$/d' filename #Delete blank lines

sed 's/ //g' filename

sed 's/[[:space:]]//g' filename

4. Delete comments after #.

The code is as follows:

sed -i 's/#.*$// g' filename

5. Kick out the logged in user and use who to view the terminal.

The code is as follows:

pkill -KILL -t pts/0

6. Delete empty files.

The code is as follows:

find / -type f -size 0 -exec rm -rf {} \;

7. Find process pid and kill.

The code is as follows:

pgrep nginx|xargs kill

pidof nginx|xargs kill

8. Get the current IP address, powerful awk, one command to get it.

The code is as follows:

ifconfig |awk -F"[ ]+|[:]" 'NR==2 {print $4}'

9. View wtmp logs in text mode

The code is as follows:

utmpdump /var/log/wtmp

10. List processes sorted by memory size

The code is as follows:

ps aux --sort=rss |sort -k 6 -rn

11. Simple web server lists the current directory file, port 8000:

The code is as follows:

python -m SimpleHTTPServer

12. Change user password by pipeline input:

The code is as follows:

echo "password" |passwd -stdin root

12. Generate SSH certificate and copy to remote server:

The code is as follows:

ssh-keygen -y -f ~/.ssh/id_rsa && cat ~/.ssh/id_rsa.pub | ssh root@host "cat - >> ~/.ssh/authorized_keys"

13. Create a new folder under shell and enter, add bashrc as follows:

The code is as follows:

mkcd ( ){

mkdir $1

cd $1

}

14. Quickly backup files to another server via SSH:

The code is as follows:

tar zcvf - back/ | ssh root@www.yisu.com tar xzf - -C /root/back/

15. Download the whole site with wget:

The code is as follows:

wget -r -p -np -k https://www.yisu.com

#r recursive p download all files np not download parent k convert relative link

Kill the entire process tree:

The code is as follows:

pstree -ap 10277|grep -oP '[0-9]{4,6}'|xargs kill -9

17. Generate random characters:

The code is as follows:

cat /dev/urandom | tr -dc 'a-zA-Z0-9' | fold -w 32 | head -n 1

18. Use awk to export the last column of non-empty data:

The code is as follows:

awk -F "|" '{if($NF!= "") print $NF}'

19. Find data that is larger than a few digits per row:

The code is as follows:

awk -F '' '{if(NF>6) print $0}'

20. Get HTML page text content:

The code is as follows:

lynx -dump www.yisu.com #URL containing page

w3m -no-cookie -dump www.yisu.com

links -dump www.yisu.com #Poor support for Chinese content

21. Port redirection:

The code is as follows:

socat TCP4-LISTEN:1234,reuseaddr,fork, TCP4:www.baidu.com:80

22. Insert before or after the line:

The code is as follows:

sed 'p;s/^.*$/--------/ ' file

awk '{print $0;print "-------"}' file

23. Insert at the beginning or end of a line:

The code is as follows:

sed 's/^/new/g' file

sed 's/$/new/g' file

24. Word for word:

The code is as follows:

awk -F "" '{for(i=1;i

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