How can you find and replace text in a file using the Windows command-line environment?

Get-Content test.txt | ForEach-Object { $_ -replace "foo", "bar" } | Set-Content test2.txt

fart.exe -p -r -c -- C:toolsperl-5.8.9* @@APP_DIR@@ C:tools

sed -c s/FOO/BAR/g filename

set str=teh cat in teh hat
echo.%str%
set str=%str:teh=the%
echo.%str%

teh cat in teh hat
the cat in the hat

set value=new_value

:: Setup initial configuration
:: I use && as the delimiter in the file because it should not exist, thereby giving me the whole line
::
echo --> Setting configuration and properties.
for /f "tokens=* delims=&&" %%a in (configconfig.txt) do (
  call replace.bat "%%a" _KEY_ %value% configtemp.txt
)
del configconfig.txt
rename configtemp.txt config.txt

@echo off

:: This ensures the parameters are resolved prior to the internal variable
::
SetLocal EnableDelayedExpansion

:: Replaces Key Variables
::
:: Parameters:
:: %1  = Line to search for replacement
:: %2  = Key to replace
:: %3  = Value to replace key with
:: %4  = File in which to write the replacement
::

:: Read in line without the surrounding double quotes (use ~)
::
set line=%~1

:: Write line to specified file, replacing key (%2) with value (%3)
::
echo !line:%2=%3! >> %4

:: Restore delayed expansion
::
EndLocal

Const ForReading = 1
Const ForWriting = 2

strFileName = Wscript.Arguments(0)
strOldText = Wscript.Arguments(1)
strNewText = Wscript.Arguments(2)

Set objFSO = CreateObject("Scripting.FileSystemObject")
Set objFile = objFSO.OpenTextFile(strFileName, ForReading)
strText = objFile.ReadAll
objFile.Close

strNewText = Replace(strText, strOldText, strNewText)
Set objFile = objFSO.OpenTextFile(strFileName, ForWriting)
objFile.WriteLine strNewText
objFile.Close

perl -pi.orig -e "s/<textToReplace>/<textToReplaceWith>/g;" <fileName>

for %x in (<filePattern>) do perl -pi.orig -e "s/<textToReplace>/<textToReplaceWith>/g;" %x