change default shell in linux

chsh command

linux login/logout profiles

Login Scripts

Behind the scenes, when you login, the following shell scripts are executed. They are used to set environment variables and system settings.

/etc/profile

• This is the first script that is executed.
• This script is used to set global parameters that are common to all users.

/home//.profile

• This is the next script that is normally executed.
• Most likely the contents of this file will be the same for all users.
• It can be changed to set unique parameters for each user.

/home//.bashrc

• This is the next script that is run and/or each time you start a new shell.

Sed Command

Keeping lines containing certain words with the sed command

sed -i -e '/firefox/!d' TheEntireIntarwebs.html

sed // The program
-i // tells sed to write the results back to the source file
-e // tells sed to interpret the next argument as a regular