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                   -e  File exists.
                   -z  File has zero size (is empty).
                   -s  File has nonzero size (returns size in bytes).
...

                   -T  File is an ASCII text file.
                   -B  File is a "binary" file (opposite of -T).

if (-f $my_file)
{
     print "Thanks for not deleting my config file $my_file\n";
...
{
     print "I'll bet you think you're funny.\n";
}