The -Command parameter is used to specify commands to be executed on launch. It supports multiple data inputs.

-Command <string>

You can specify commands to executed on launch as a string. Multiple semicolon ;-separated statements may be executed.

>PowerShell.exe -Command "(Get-Date).ToShortDateString()"
10.09.2016

>PowerShell.exe -Command "(Get-Date).ToShortDateString(); 'PowerShell is fun!'"
10.09.2016
PowerShell is fun!

-Command { scriptblock }

The -Command parameter also supports a scriptblock input (one or multiple statements wrapped in braces { #code }. This only works when calling PowerShell.exe from another Windows PowerShell-session.

PS > powershell.exe -Command {
"This can be useful, sometimes..."
(Get-Date).ToShortDateString()
}
This can be useful, sometimes...
10.09.2016

-Command - (standard input)

You can pass in commands from the standard input by using -Command -. The standard input can come from echo, reading a file, a legacy console application etc.

>echo "Hello World";"Greetings from PowerShell" | PowerShell.exe -NoProfile -Command -
Hello World
Greetings from PowerShell