Use of uninitialized value $cwd in concatenation (.) or string at /usr
+/share/perl5/File/Find.pm line 283.
Can't cd to : No such file or directory
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That's strange... in the source, I don't see $cwd getting set by anything other than Cwd's getcwd (in your case at least). Just as a test, try adding use Cwd; to your code, and right before you call find, add print "cwd: ",getcwd()||$!,"\n"; to see if there's an obvious reason getcwd is failing.