better fuzzy matching + vfs type flag in Files

sys/init/3.sys.lua

@@ -6,37 +6,41 @@ fs.loadTab('sys/etc/fstab')
 -- add some Lua compatibility functions
 function os.remove(a)
 	if fs.exists(a) then
-        local s = pcall(fs.delete, a)
-        return s and true or nil, a .. ': Unable to remove file'
+		local s = pcall(fs.delete, a)
+		return s and true or nil, a .. ': Unable to remove file'
 	end
 	return nil, a .. ': No such file or directory'
 end
 
 os.execute = function(cmd)
-    if not cmd then
-        return 1
-    end
+	local env = _G.getfenv(2)
+	if not cmd then
+		return env.shell and 1 or 0
+	end
 
-    local env = _G.getfenv(2)
-    local s, m = env.shell.run('sys/apps/shell.lua ' .. cmd)
+	if not env.shell then
+		return 0
+	end
 
-    if not s then
-        return 1, m
-    end
+	local s, m = env.shell.run('sys/apps/shell.lua ' .. cmd)
 
-    return 0
+	if not s then
+		return 1, m
+	end
+
+	return 0
 end
 
 os.tmpname = function()
-    local fname
-    repeat
-        fname = 'tmp/a' .. math.random(1, 32768)
-    until not fs.exists(fname)
+	local fname
+	repeat
+		fname = 'tmp/a' .. math.random(1, 32768)
+	until not fs.exists(fname)
 
-    return fname
+	return fname
 end
 
 -- non-standard - will raise error instead
 os.exit = function(code)
-    error('Terminated with ' .. code)
+	error('Terminated with ' .. code)
 end