Display Files

more / less: Paging through text one screenful at a time.

Keys:

   q : Quit.
   SPACE : Page down.
   b : Page up.

head / tail: Output the first / last part of files.

Options:

 -n, --lines=NUMBER : print first / last NUMBER lines instead of first 10

cat: Concatenate files and print on the standard output.

       cat [OPTION] [FILE]...

edit: vi, emacs, xemacs, xedit, ...