What does this do in CMD

[NoHamNoJam]

Quote

echo off
echo Welcome
CLS
title Pranked
a
start cmd.exe @cmd /k "ping localhost -t"
goto a

A friend of mine sent me this he had pranked me before with opening infinite CMDs and this time I out witted him and pressed 'Edit' before opening any way what does this do

[Guest]

start cmd.exe

goto a

start cmd.exe

and so on

[MoVo]

This script is an infinite loop opening CMD´s and pinging the local host address. Actually pretty boring ;D 

[minibois]

Basically, it starts another cmd.exe over and over again and does a command.

[Ryoutarou97]

10 minutes ago, NoHamNoJam said:

This time I outwitted him

Not yet.

[Factory Factory]

Worst case, it will basically attempt to DDOS and/or forkbomb your PC if you run it, with the first window changing its title to "Pranked."

 

Echo off means it won't repeat commands

Echo "some string" will print that string

cls will clear the screen.

a and goto a are a label and a loop command

cmd /k spawns a new command line process that runs the command written in the rest of the string.

ping -t pings until

 

So this process will spawn pings as fast as it is able, assuming the root script loops regardless of what its child processes are doing.

 

But that's an assumption. It might never get to the loop because it waits for the child cmd.exe session to finish. In that case instead it would just ping localhost in a single process and not spawn multiple copies, but once you closed and exited that ping, it WOULD loop and the ping would just start up again. Not hard to get rid of, definitely annoying, but not a computer-crashing event.