local shell=require("shell")
local fs=require("filesystem")

local args=shell.parse(...)
if#args==0 then
args={"-"}
end

local input_method,input_param="read",require("tty").getViewport()

for i=1,#args do
local arg=shell.resolve(args[i])
if fs.isDirectory(arg)then
io.stderr:write(string.format('cat %s: Is a directory\n',arg))
os.exit(1)
else
local file,reason
if args[i]=="-"then
file,reason=io.stdin,"missing stdin"
input_method,input_param="readLine",false
else
file,reason=fs.open(arg)
end
if not file then
io.stderr:write(string.format("cat: %s: %s\n",args[i],tostring(reason)))
os.exit(1)
else
repeat
local chunk=file[input_method](file,input_param)
if chunk then
io.write(chunk)
end
until not chunk
file:close()
end
end
end

io.stdout:close()