The usage is actually the same as man command in Linux environment. If you are looking on the command details and usage, you can use the get-help command.
Please see an example below, we are looking for details information on command cp.
PS C:\> get-help cp
NAME
Copy-Item
SYNTAX
Copy-Item [-Path] <string[]> [[-Destination] <string>] [-Container] [-Force] [-Filter <string>] [-Include
<string[]>] [-Exclude <string[]>] [-Recurse] [-PassThru] [-Credential <pscredential>] [-WhatIf] [-Confirm]
[-UseTransaction] [<CommonParameters>]
Copy-Item [[-Destination] <string>] -LiteralPath <string[]> [-Container] [-Force] [-Filter <string>] [-Include
<string[]>] [-Exclude <string[]>] [-Recurse] [-PassThru] [-Credential <pscredential>] [-WhatIf] [-Confirm]
[-UseTransaction] [<CommonParameters>]
ALIASES
cpi
cp
copy
REMARKS
Get-Help cannot find the Help files for this cmdlet on this computer. It is displaying only partial help.
-- To download and install Help files for the module that includes this cmdlet, use Update-Help.
-- To view the Help topic for this cmdlet online, type: "Get-Help Copy-Item -Online" or
go to http://go.microsoft.com/fwlink/?LinkID=113292.
By the way, for you information, you can get the same information by executing the help or man command which is actually the same as Linux environment.
man cp
help cp
If you notice on above message (on the remarks), “Get-Help cannot find the Help files for this cmdlet on this computer. It is displaying only partial help.” You can actually view the message via online by executing below command and it will automatically open it on the web browser.
Get-Help Copy-Item -Online
If you don’t want to view it online, just download it using below command
PS C:\> Update-Help
Updating Help for module CimCmdlets
Downloading Help Content...
