Table: file_content_retrieval
Columns: 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?
SQL: SELECT "unix_shell" FROM file_content_retrieval WHERE "powershell_cmdlet" = 'Select-String'

Question: What are all values of CMD.EXE / COMMAND.COM for the unix shell echo?
SQL: SELECT "cmd_exe_command_com" FROM file_content_retrieval WHERE "unix_shell" = 'echo'

Question: If Powershell (alias) is cpi, copy, cp, what are all corresponding descriptions. 
SQL: SELECT "description" FROM file_content_retrieval WHERE "powershell_alias" = 'cpi, copy, cp'

Question: When the cmd.exe / command.com is type, what are all associated values for powershell (cmdlet)?
SQL: SELECT "powershell_cmdlet" FROM file_content_retrieval WHERE "cmd_exe_command_com" = 'type'

Question: How many values of powershell (cmdlet) are valid when unix shell is env, export, set, setenv?
SQL: SELECT COUNT("powershell_cmdlet") FROM file_content_retrieval WHERE "unix_shell" = 'env, export, set, setenv'