Batch script explanation

Question

I'm new to batch scripts and I don't know what >nul in this self-replicating file code means.Can you explain it please?

copy %0 "new.bat" > nul

Stephan · Accepted Answer · 2014-01-11 18:34:23Z

1

> means: "put the output to..."

nul is a "Nirwana-Device"

so

> nul will send the output of the copycommand to Nirwana, so that it doesn't write to the screen.

You could also write the output to a file with >file.txt

For example try these lines:

echo hello world
echo hello world again >nul
echo hello beautiful world >file.txt 
type file.txt

answered Jan 11, 2014 at 18:34

Stephan

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benimen16 · Accepted Answer · 2014-04-17 01:30:09Z

0

Just like what Stephan said, these examples work very well too.

timeout /t 01
timeout /t 01>nul

timeout is a command that is a timer which will countdown (in seconds) the specified number you type (which is 01 in this example) /t simply stands for time.

answered Apr 17, 2014 at 1:30

benimen16

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