Windows

Poweshell command to rename a file leaving only the first two characters. (Note: If you want to do this again, it is easier to use neoedit to generate ren commands and run them in cmd):

Get-ChildItem . | Rename-Item -NewName { $_.Name -replace '^(?<g1>..).*$','${g1}.mp3' }

Find all files that contain a string:
/s : Searches for matching files in the current directory and all subdirectories.
/I: case Insensitive
/c: string : Uses specified text as a literal search string.

findstr /Isc:"STRING TO FIND" *.cs

Find a file in current directory and all subdirectories:

dir /b /s FILENAME

Find the full path to an executable. Equivalent to Linux’ which command:

for %i in (EXECUTABLENAME.EXTENSION) do @echo. %~$PATH:i

Restart all IIS websites:

iisreset /restart

System startup configration:

msconfig

Edit the Windows registry:

regedit

List all network ports currently in use:

netstat -a: lists all ports currently in use

View password policy that applies to a computer

net accounts

Get the password (or other info from the ProcessModel) of the user running an IIS app pool:

appcmd list apppool "AppPoolNameHereInsideDoubleQuotes" /text:ProcessModel.Password