Information about how-to use different aspects of the command line (also referred to as Shell, Terminal, Console and CLI)

General

CommandlinePrograms CommandLine software list

BashQuickTips BASH quick tips

HowToCopyFromTerminal How to copy and paste from terminal

CommandLine Shells (CLI)

Shell About Shells

Ash

Bash

BusyBox - Linux utilities all-in one

Sh

Commands

AshCommands

BashCommands

BootParameters

Filesystem Utilities

e2fsck - ext2/3/4 filesystem check (part of e2fsprogs)

find - search for files using various parameters

rsync - incremental file transfer

File Checks

md5sum - hash check

sha1sum - hash check

Linux Environment Variables

env - this command lists all the variables present

PATH

e2fsprogs - Ext2/3/4 Filesystem Utilities

xev - monitor inputs and events

Online Commandlines

http://www.goosh.org/

http://cb.vu/

http://www.masswerk.at/jsuix/

General

Basic Shell (Console) operation for beginners

The Text-User Interface

Learning the shell

Bash Introduction

Most popular commands by vote

Command-line interface tutorial (youtube)