Note to myself

apt-get -f upgrade
apt-get update
dpkg -i bla bla bla

http://www.thegeekstuff.com/2009/04/vi-vim-editor-search-and-replace-examples/

http://www.tecmint.com/wc-command-examples/

http://www.thegeekstuff.com/2012/10/15-linux-split-and-join-command-examples-to-manage-large-files/

http://www.livefirelabs.com/unix_commands/5-unix-diff-command-examples-of-how-to-compare-two-text-files.htm

http://www.joshstaiger.org/archives/2005/07/bash_profile_vs.html

https://www.cyberciti.biz/tips/howto-keep-file-safe-from-overwriting.html

Creating group, giving sudo privileges and adding user to the group

Step 1: Login to root account
..$ su

Step 2: Adding user
..# useradd -m frank

Step 3: Creating group
..# groupadd rangers

Step 4: Edit sudoers and add rangers into
..# vim /etc/sudoers

# Allow members of group sudo to execute any command
%sudo   ALL=(ALL:ALL) ALL
%rangers  ALL=(ALL:ALL) ALL

save and exit

Step 5: Adding frank to rangers

..# usermod -a -G rangers frank

Finished.

Now you have a user frank in the rangers group, which was added to sudoers file.

You should able to use sudo while you are frank.

locate command

Before using locate  command, you should update db
..$ sudo updatedb

then you can use locate.
..$ locate mypicture

Fast Search

There are couple of ways to make searching.

One of them:

ls | grep

..$ ls | grep dir
workingdir
direct
dire

It shows us anything contains dir.



note:
cat /etc/issue

shows you to which os currently you have.