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DllCall("AllocConsole")
DllCall("SetConsoleTitle", "Str", uname := "ahkunix 1.0")
FileAppend, You have no mail., con
While l != "halt"
{
   FileAppend, `n$%A_Space%, con
   FileReadLine, l, con, 1
   FileAppend, % l == "uname" ? uname : "command not found", con
}

DllCall("AllocConsole")
DllCall("SetConsoleTitle", "str", uname := "ahkunix 1.1`n")
FileAppend, You have no mail.`n`n, con
while l != "halt"
{
   FileAppend, %A_UserName%@%A_ComputerName% ~$%A_Space%, con
   FileReadLine, l, con, 1
   FileAppend, % l == "uname" ? uname : ((l != "halt" && l != "") ? "command not found`n" : ""), con
}