[R] parsing dir output for file sizes

[Griffith Feeney]

I've got an R wrapper around an old DOS program. In the R program I need to 
test whether the DOS program failed to produce certain output. This is 
indicated by certain text files created by the DOS program being empty.

I can use system(command, intern=TRUE) to get the output of a DOS dir for a 
test file, but I'm having trouble parsing this to get the file size.

Is there an R function to find the first occurrence of a character in a 
character string (seems there must be, but I'm at a loss to find it)? Or 
can anyone suggest a better approach?

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