Linux Shell Learning

1. Man Shows color characters

In ~ /. Add the following content to bashrc:

Export less_termcap_mb = $ '/E [01; 31m'
Export less_termcap_md = $ '/E [01; 31m'
Export less_termcap_me = $ '/E [0m'
Export less_termcap_se = $ '/E [0m'
Export less_termcap_so = $ '/E [01; 44; 33m'
Export less_termcap_ue = $ '/E [0m'
Export less_termcap_us = $ '/E [01; 32m'

 

2. Forcibly clear the recycle bin

$ Sudo Rm-RF $ home/. Local/share/trash/Files

(The recycle bin path after Ubuntu 8.04 is $ home/. Local/share/trash, and before Ubuntu 8.04 is $ home/. Trash)

 

3. Configure the path of the configuration file in the Open Mode

Global:/etc/gnome/defaults. List

User :~ /. Local/share/applications/defaults. List

 

4. Clear/display the icon of the mounted hard disk on the desktop

Clear icon: gconftool-2 -- set/apps/Nautilus/desktop/volumes_visible 0 -- type bool

Show icons: gconftool-2 -- set/apps/Nautilus/desktop/volumes_visible 1 -- type bool

 

5. Synchronize Internet server time

$ Sudo ntpdate ntp.ubuntu.com

$ Sudo ntpdate time.nist.gov

 

6. delete all "~ "End file

$ Find.-Name "*~ "-Exec RM {}/;

 

7. Delete all files modified 30 days ago

$ Find.-Type F-mtime + 30-mtime-3600-exec RM {}/;

 

8. display the subdirectories of the current directory

$ LS-D */.

$ Echo */.

 

9. Replace uppercase letters in the file name with lowercase letters.

Rename 'tr/A-Z/a-Z '*

 

10. Ssh File Transfer

1) Copy local files to the remote server:

$ SCP-RP/path/filename username @ remoteip:/path

2) download files from the remote server to the local device:

$ SCP-RP username @ remoteip:/path/filename/path

 

11. Remove the file suffix

$ Echo XXX. c | SED's // (. */)/.. * $/1 /'

 

12. multi-thread download

$ Sudo apt-Get install Axel

$ Axel-N 5 http://www.xxx.xxx/xx.zip

 

13. view route information$ Netstat-Rn $ sudo route-n 14. view the program listening to port 80$ Lsof-I: 80 15. display the process of opening file a.txt$ Lsof a.txt 16. view files opened by the ProcessLsof-P process_id 17. Killing botnetsPS-eal | awk '{if ($2 = "Z" {print $4}' | xargs sudo kill-9 18. Run the program in graphical mode.$ Xkill 19. Continuous monitoring memory usage cleared$ Watch-D free (CTRL + C Exit)

20. The USB flash drive cannot be detached.

$ Sync

$ Fuser-km/Media/USB

 

21. Convert OTF to TTF

$ Sudo apt-Get install fontforge

Create an otf2ttf. Sh file:

#! /Usr/local/bin/fontforge
# Converts a font to TrueType (. TTF)
Print ("Opening" + $1 );
Open ($1 );
Print ("saving" + $1: R + ". TTF ");
Generate ($1: R + ". TTF ");
Quit (0 );

 

Conversion command: $ fontforge-script otf2ttf. Sh <. TTF font file>

Batch conversion: $ for I in *. otf; do fontforge-script otf2ttf $ I; done

Source: http://www.stuermer.ch/blog/convert-otf-to-ttf-font-on-ubuntu.html

 

22. File Segmentation

$ Split-B 2 m largefile lf _

Split largefile into small files whose names are prefixed with LF and whose size is 2 MB.

 

23. List open files

$ Lsof

 

24. When the file is displayed, the row number is also displayed.

$ Nl xxx. cpp

 

25. ls to list absolute paths of Objects

 

$ Ls | sed "s: ^: 'pwd '/:"

 

 

Reference: [Ubuntu command tip manual]