But what then is the _?

Look up "perldoc -f -X"; the underscore means "get this information from the same stat data structure that we used the last time", which saves a few ops. "-r _" assures that the file we just checked with "-f" is readable by the current user.

In reply to Re^3: backup script runs out of memory by graff
in thread backup script runs out of memory by gri6507

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