File Tests

A bunch of operators are used to check whether files exist, directories exist, files are readable, etc.

-e <filename>

file exists

-r <filename>

file is readable

-x <filename>

file is executable

-w <filename>

file is writable

-d <filename>

filename is a directory

  -w "./fasta.out" or die "Can't write to file";

  print "This file is executable\n" if -x "/usr/bin/perl";

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