How to View All Environment Variable and Their Values

Mac:

Open a terminal window and type printenv

~$ printenv

Windows (DOS):

Open a Command Prompt and type set

c:\Users\username? set

Windows (Powershell):

Open a Powershell window and type Get-Childitem env:

PS C:\Users\username> Get-Childitem env:               

Links
Mac/Unix Bash Shell
Dos
Powershell

View Hidden Files via CMD (dos command)

 dir /ah

DOS CMD - Show All Files (even in subdirectories)

dir /s /b

Thanks to Michael Todd

Everyone's Doing It - Creating Symbolic Link

MKLINK [[/D] | [/H] | [/J]] Link Target
 
/D      Creates a directory symbolic link.  Default is a file
symbolic link.
/H      Creates a hard link instead of a symbolic link.
/J      Creates a Directory Junction.
Link specifies the new symbolic link name.
Target specifies the path (relative or absolute) that the new link
refers to.

Example: mklink /D \MyDocs /J C:\Users\User1\Documents

How to Create Symbolic Link in Windows7!

The Useful Device "nul"

You can throw out command line error message by sending output to the nul device!

Windows Command Tips & Tricks
Google: device null

Pipe Commands to the Clipboard

You can redirect command output to tthe clipboard by using " | clip"

Examples:

REM copy directory content to the clipboard
dir | clip

REM copy computer name to the clipboard
hostname | clip

DOS CMD - List All Directory Names Only

dir /AD /B


more commands

DOS CMD - List All File Names Only

dir /a:-d /b


cheers to fheartman

more commands