Ubuntu power user tricks

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#All these command tested on, Ubuntu 16.04 LTS till date of this blog post.

GNU/Linux, 4.15.0-47-generic, x86_64, #50~16.04.1-Ubuntu SMP machine.

1. To increase opened recent files in gedit on terminal type,

gsettings set org.gnome.gedit.preferences.ui max-recents "uint32 60"

2. Mail from command line, you need, sponge, mailutils and ssmtp .

To install sponge on a Debian-like system:

apt-get install moreutils
sudo apt install mailutils
sudo apt-get install ssmtp

open,
sudo vim /etc/ssmtp/ssmtp.conf

And add the following to the file:

AuthUser=<user>@gmail.com
AuthPass=Your-Gmail-Password
mailhub=smtp.gmail.com:587
UseSTARTTLS=YES

test it
# cat some-text-file | mail -s "Test" my.user@gmail.com

3. Test with building android, do envsetup.sh and lunch

# make -j4 showcommands &> build.log ; tail -n 100 build.log | sponge build_aosp8-tail.log | mail -s "Test log" my.user@gmail.com

4. A better command terminal tmux (you can use screen for similar functionality)

Taken from here,

https://github.com/gpakosz/.tmux

Some package commands

5. List all installed packages: apt list --install

6. Upgrade all the currently installed software packages on the system: apt-get upgrade

7. Resynchronize the package index files from the their sources specified in /etc/apt/sources.list file: apt-get update

8. Un-install software packages without removing their configuration files: apt-get remove <package-name>

9. Remove software packages including their configuration files: apt-get purge <package-name>

10. Free up the disk space by cleaning retrieved (downloaded) .deb files (packages) from the local repository: apt-get clean

11. Update package cache and checks for broken dependencies.: apt-get check

12. Searche the local repositories in the system and install the build dependencies for package: apt-get build-dep <package-name>

13. display raw information about dependencies of a particular package:  apt depends <package-name>

14. View Information About Package: apt show <package-name>

15. tmux terminal basic key shortcuts

     ctrl-a % - vertical split
     ctrl-a " - horizontal split
     ctrl-a <arrow keys> - go to desired terminal, or
     ctrl-a <1, 2 or whichever window>

16. screen session
 
Ctrl-a c Create new window (shell)
Ctrl-a ? Help (display a list of commands)
Ctrl-a Ctrl-\ Quit screen
Ctrl-a D (Shift-d) Power detach and logout
Ctrl-a d

To kill a screen session, to go to a screen session, list screen sessions :

screen -ls
# screen -r <PID>

 Then issue ,

 ctrl-a then :quit

or just do this,

# screen -X -S <PID>

You can't use tmux with screen as 'ctrl-a d' will kill tmux instead of detaching the screen session. Checkout this video on youtube, for similar capabilites on screen,

Good_screen_tutorial for screen tutorial.

18. Exclude specific file types

           # grep  -r "ethernet0" --exclude=\*.{dtb,tmp} .

above command will exclude .dtb and .tmp files from search.


19. Compress only contents of a directory, and put the tar in previous directory,

          # cd <path_to_dir> && tar -zcf ../<contents>.tar .  && cd -


For any issue, kindly post in comments. I hope to grow this list and thank to people who make great tools for users. Will try to post original blog links, authors or repositories.

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