25 Useful shell Scripts Common command sharing _linux shell

1. List all directory usage and sort by size.

Copy Code code as follows:

Ls|xargs Du-h|sort-rn
#不递归下级目录使用du-sh

2. View the file exclusion with the # switch and blank line, suitable for viewing the configuration file.

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Egrep-v "^#|^$" filename
Sed '/#.*$/d; /^ *$/d '

3. Delete spaces and blank lines.

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Sed '/^$/d ' filename #删除空行
Sed ' s///g ' filename
Sed ' s/[[:space:]]//g ' filename

4. Delete the comment after #.

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

5. Kick out the logged in user, use Who to view terminal.

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Pkill-kill-t pts/0

6. Delete empty files.

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

7. Find process pid and kill.

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Pgrep Nginx|xargs Kill
Pidof Nginx|xargs Kill

8. Get the current IP address, powerful awk, a command to fix.

Copy Code code as follows:

Ifconfig |awk-f "[]+| [:] "' nr==2 {print $} '

9. Text Mode view wtmp log

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Utmpdump/var/log/wtmp

10. List processes in memory size

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

11. Simple Web server lists the current directory files, Port 8000:

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Python-m Simplehttpserver

12. Modify the user password by pipeline Input method:

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echo "Password" |passwd–stdin root

12. Generate SSH certificate and copy to remote server:

Copy Code code as follows:

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

13.shell to create a new folder and enter, add the following BASHRC:

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MKCD () {
mkdir $
CD $
}

14. Fast backup files to another server via SSH:

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Tar zcvf-back/| SSH root@www.jb51.net tar xzf--c/root/back/

15. Download the whole station with wget:

Copy Code code as follows:

Wget-r-p-np-k http://www.jb51.net
#r递归 p Download All files np not load superior K convert relative link

16.Kill entire process tree:

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

17. Generate Random characters:

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Cat/dev/urandom | Tr-dc ' a-za-z0-9 ' | Fold-w 32 | Head-n 1

18. Use awk to export the last column of data that is not empty:

Copy Code code as follows:

Awk-f "|" ' {if ($NF!= "") Print $NF} '

19. Find data that is larger than several numbers per row:

Copy Code code as follows:

Awk-f ' {if (nf>6) print $} '

20. Get HTML page text content:

Copy Code code as follows:

Lynx-dump www.jb51.net #包含页面的URL
W3m-no-cookie-dump www.jb51.net
Links-dump www.jb51.net #对中文内容支持不好

21. Port redirection:

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Socat Tcp4-listen:1234,reuseaddr,fork, tcp4:www.baidu.com:80

22. Insert before or after line:

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Sed ' p;s/^.*$/--------/' file
awk ' {print $0;print '-------'} ' file

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

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Sed ' s/^/new/g ' file
Sed ' s/$/new/g ' file

24. Verbatim line-changing:

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Awk-f "" ' {for (i=1;i<=nf;i++) print $i} '

25. A large number of files in the directory deletion:

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ls | Xargs RM