cd=fs.cd
rm=fs.rm
mkdir=fs.mkdir
function ls(p)
 for k,v in ipairs(fs.list(p)) do print(v) end
end
function cat(p)
 local f=io.open(p)
 print(f:read("*a"))
 f:close()
end
function ps(f)
 local f=f or ""
 print("PID\tName")
 for k,v in pairs(os.tasks()) do
  if v:find(f) then
   print(tostring(k).."\t"..tostring(v))
  end
 end
end
function mem()
 print(" \tTotal\tFree\tUsed")
 io.write("Mem\t")
 io.write(tostring(math.floor(computer.totalMemory()/1024)).."K\t")
 io.write(tostring(math.floor(computer.freeMemory()/1024)).."K\t")
 print(tostring(math.floor((computer.totalMemory()-computer.freeMemory())/1024)).."K\t")
end
function loadfile(fn)
 local f=io.open(fn,"rb")
 local S=f:read("*a")
 f:close()
 return load(S,"=("..fn..")","bt",os.genenv())
end
function run(fn,...)
 local r = {pcall(loadfile(fn),...)}
 if r[1] == true then
  table.remove(r,1)
 end
 print(table.unpack(r))
end
function srun(fn,...)
 spawn(fn,print(pcall(loadfile(fn),...)))
end