PowerShell equivalent to the Unix `which` command?

"This was asked and answered on Stack Overflow: Equivalent of *Nix 'which' command in PowerShell?

The very first alias I made once I started customizing my profile in PowerShell was 'which'.

New-Alias which get-command

To add this to your profile, type this:

""`nNew-Alias which get-command"" | add-content $profile

The `n at the start of the last line is to ensure it will start as a new line."

"Also answered in 2008: Is there an equivalent of 'which' on the Windows command line?

Try the where command if you've installed a Resource Kit.

Most important parts of the answer:

Windows Server 2003 and later provide the WHERE command which does
some of what which does, though it matches all types of files, not
just executable commands.

[snip]

In Windows PowerShell you must type where.exe."