commands detail - b
basename
A rough PowerShell equivalent for the unix basename is:
dir <whatever> | select name
This depends on the file actually existing, whereas basename doesn’t care.
A more precise (but perhaps less concise) alternative[1] is:
[System.IO.Path]::GetFileName('c:\temp\double_winners.txt')
Notes
[1] I found [System.IO.Path]::GetFileName
after reading Power Tips of the Day - Useful Path Manipulations Shortcuts, which has some other useful commands