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Pseudo code:

if file exists: do xxxx done else: do xxxx done
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You can use exist:

if exist somefile.dat echo It exists

Depending on the "dialect", you can use else statements. At the lowest level, though, some rather ugly logic like this works:

if exist somefile.dat goto fileexists echo file does not exist goto alldone :fileexists echo file exists :alldone
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Syntax is as follows:

IF [NOT] EXIST filename command

You can use the [NOT] option to execute code if a file doesn't exist as opposed to if the file does exist, however this can be done as an ELSE staement in a standard IF EXIST statement.

IF EXIST stuff.txt ( ECHO It exists ) ELSE ( ECHO It doesn't exist )
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