forgot to commit openos

data/openos/bin/echo.lua

@@ -0,0 +1,22 @@
+local args, options = require("shell").parse(...)
+if options.help then
+  io.write([[
+`echo` writes the provided string(s) to the standard output.
+  -n      do not output the trialing newline
+  -e      enable interpretation of backslash escapes
+  --help  display this help and exit
+]])
+  return
+end
+if options.e then
+  for index,arg in ipairs(args) do
+    -- use lua load here to interpret escape sequences such as \27
+    -- instead of writing my own language to interpret them myself
+    -- note that in a real terminal, \e is used for \27
+    args[index] = assert(load("return \"" .. arg:gsub('"', [[\"]]) .. "\""))()
+  end
+end
+io.write(table.concat(args," "))
+if not options.n then
+  io.write("\n")
+end