os:shell

Table of Contents

About

This page is about shell in an OS context

A shell is a command line interpreter for OS Command.

In a more detailed way, a shell is:

an interactive application
providing a read-eval-print loop environment (REPL)
for
- built-in command of the operating system kernel
- and third party command from executable
in a terminal

Each time:

we launch a shell, the operating system creates a new process.
the shell starts a third party command, the shell creates a new process / thread.

Management

List

Windows:
- Dos (Win32 Shell Scripting) and Utilities
- PowerShell
Linux - Shell
- Bash - Bash cli
More … Operating_system_shells

Remote

You can access shell remotely with the following application protocol

SSH (secured)
Telnet (non-secured)

Features

tab-completion,
command history

Color

Every extension file has a color. See

dircolors

LS_COLORS='
rs=0:di=01;
34:ln=01;
36:mh=00:pi=40;
33:so=01;
35:do=01;
35:bd=40;
33;
01:cd=40;
33;
01:or=40;
31;
01:su=37;
41:sg=30;
43:ca=30;
41:tw=30;
42:ow=34;
42:st=37;
44:ex=01;
32:*.tar=01;
31:*.tgz=01;
31:*.arc=01;
31:*.arj=01;
31:*.taz=01;
31:*.lha=01;
31:*.lz4=01;
31:*.lzh=01;
...;

export LS_COLORS

The colors numbers are Terminal Colors number