DOS BAT file equivalent to Unix basename command

A lot of the answers here helped point me in the right direction, however none were suitable for me, so I am posting my solution.

I have Windows 7, which comes with PowerShell built-in. Here is the script I used to find/replace all instances of text in a file:

powershell -Command "(gc myFile.txt) -replace 'foo', 'bar' | Out-File -encoding ASCII myFile.txt"

To explain it:

• powershell starts up powershell.exe, which is included in Windows 7
• -Command "... " is a command line arg for powershell.exe containing the command to run
• (gc myFile.txt) reads the content of myFile.txt (gc is short for the Get-Content command)
• -replace 'foo', 'bar' simply runs the replace command to replace foo with bar
• | Out-File myFile.txt pipes the output to the file myFile.txt
• -encoding ASCII prevents transcribing the output file to unicode, as the comments point out

Powershell.exe should be part of your PATH statement already, but if not you can add it. The location of it on my machine is C:\WINDOWS\system32\WindowsPowerShell\v1.0

Update
Apparently modern windows systems have PowerShell built in allowing you to access this directly using

(Get-Content myFile.txt) -replace 'foo', 'bar' | Out-File -encoding ASCII myFile.txt

The most common ways to use the shutdown command are:

• shutdown -s — Shuts down.
• shutdown -r — Restarts.
• shutdown -l — Logs off.

• shutdown -h — Hibernates.

  Note: There is a common pitfall wherein users think -h means "help" (which it does for every other command-line program... except shutdown.exe, where it means "hibernate"). They then run shutdown -h and accidentally turn off their computers. Watch out for that.

• shutdown -i — "Interactive mode". Instead of performing an action, it displays a GUI dialog.

• shutdown -a — Aborts a previous shutdown command.

The commands above can be combined with these additional options:

• -f — Forces programs to exit. Prevents the shutdown process from getting stuck.
• -t <seconds> — Sets the time until shutdown. Use -t 0 to shutdown immediately.
• -c <message> — Adds a shutdown message. The message will end up in the Event Log.

• -y — Forces a "yes" answer to all shutdown queries.

  Note: This option is not documented in any official documentation. It was discovered by these StackOverflow users.

I want to make sure some other really good answers are also mentioned along with this one. Here they are in no particular order.

• The -f option from JosephStyons
• Using rundll32 from VonC
• The Run box from Dean
• Remote shutdown from Kip