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Basic
Editors
Create a file using cat with all the names of your friends.
Concatenate the file with some other names
Search for a name in the file using sed
Replace a name with another using sed. Redirect it to another file name.
Search for the name in the file using Nano
Write a Hello world program in emacs
Split the windows in emacs
Find out copy and paste in emacs. Also, about M-x increase-left-margin
Python