human
Considering the provided database schema and associated query, produce SQL code to retrieve the answer to the query. 
###Database Schema: PowerShell (Cmdlet), PowerShell (Alias), CMD.EXE / COMMAND.COM, Unix shell, Description
###Question: What are the names of all unix shell with PowerShell (Cmdlet) of select-string?
gpt
SELECT Unix shell FROM table WHERE PowerShell (Cmdlet) = Select-String