Create batch file that sees whether file exists and if not exits

How do I create a batch file that sees whether file exists and if not exits?
Paul BurrowsAsked:
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Bill PrewCommented:
Simple as:

if not exist yourfile.txt exit /b

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~bp
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Paul BurrowsAuthor Commented:
Thanks ..... what does the /b signify?
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Bill PrewCommented:
That specifies to just end the current bat script, not the whole CMD shell running.  This way if the script doing the EXIT /B was called from another BAT script, control will return to the calling script.  Without the /B the calling script will not get control and the whole CMD shell is killed.

You will often see people write this same thing as:

if not exist yourfile.txt goto :EOF

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which does the same thing, exit the current script by "going to end of file" in the script.

~bp
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Paul BurrowsAuthor Commented:
Fantastic ... thanks very much
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Microsoft DOS

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