local tArgs = { ... }
if #tArgs > 2 then
	print( "Usage: alias <alias> <program>" )
	return
end

local sAlias = tArgs[1]
local sProgram = tArgs[2]

if sAlias and sProgram then
	-- Set alias
	shell.setAlias( sAlias, sProgram )
elseif sAlias then
	-- Clear alias
	shell.clearAlias( sAlias )
else
	-- List aliases
	local tAliases = shell.aliases()
	local tList = {}
	for sAlias, sCommand in pairs( tAliases ) do
		table.insert( tList, sAlias )
	end
	table.sort( tList )
	textutils.pagedTabulate( tList )
end