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set command

Q. I find vi hard to use. How do I change my default text editor from vim / vi to Pico under Debian Linux?

A. To use and change an editor to edit your text message, set the variable EDITOR to the pathname of the vi / vim binary file. You need to use export or set command for the same purpose.

Many Linux / UNIX command read shell EDITOR environment variable to determine which editor to use for editing a text file.

Set default text editor to pico

Type the command as follows:
$ which pico
Output:

/usr/bin/pico

Now setup a new text editor:
export EDITOR=/usr/bin/pico
OR
export EDITOR=pico

Add above line to ~/.bashrc file:
$ vi ~/.bashrc
Append text as follows:
export EDITOR=pico
Close and save the file. There is no no need to reboot system.

Also you can add alias if you want:
alias vi=/usr/bin/pico

Q. I’m using BASH shell filename tab completion feature to complete file names and other stuff. However default tab-completion in bash case-sensitive. It cannot show me /tmp/Y* or /tmp/Y* files. How do I force filename tab-completion in bash case insensitive?

A. According to bash man page completion-ignore-case set to Off. If set to On, readline performs filename matching and completion in a case-insensitive fashion. Readline has variables that can be used to further customize its behavior. A variable may be set in the /etc/inputrc file with a statement of the form. So all you have to do is type following command:
$ set completion-ignore-case on

You need to add set completion-ignore-case on to /etc/inputrc command:
vi /etc/inputrc
Append text as follows:
set completion-ignore-case on
Close and save the file. For more information read bash man page.