.TH SKIP-IF-FILE-EXISTS 1 2020-10-03 NCBI "NCBI Entrez Direct User's Manual" .SH NAME skip\-if\-file\-exists \- filter out lines naming existing files .SH SYNOPSIS .B skip\-if\-file\-exists .SH DESCRIPTION \fBskip\-if\-file\-exists\fP reads a list of potential filenames from standard input (one per line) and prints on standard output those lines naming files that do not (yet) exist. .SH SEE ALSO .BR nquire (1).