Shell

A shell is an interface which allows you to give commands to a computer and receive responses.

They allow for the execution of scripts and are highly automatable.

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Examples

Some popular shells include:

• [Bash](https://en.wikipedia.org/wiki/Bash_(Unix_shell)
• Zsh
• PowerShell
• Nushell

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Operation

Shell commands take inputs, error and give outputs in a POSIX standardised way. Hence, it becomes very easy to orchestrate shells together to execute complex tasks.

ps | fzf

This command takes the output of ps or “process show” which lists the currently running processes on the computer, and pipes it into fzf or fuzzy find, which provides a TUI for searching through a list.

With this combination you can search all the currently running processes on your machine.