Found some funny results when testing the -f operator versus ! -d on my Windows 7 system. 
C:\Old_Data\perlp>perl -wE "opendir DIR, 'CSV';say for grep -f, readdi
+r DIR"
dat.txt
DBD_CSV.pl
my_db.txt
my_db_2.txt
o33.csv
o33.txt
o44.txt
o55.csv
text_csv.pl
zip_codes.csv

C:\Old_Data\perlp>perl -wE "opendir DIR, 'CSV';say for grep ! -d, read
+dir DIR"
csvfile.pl
dat.txt
DBD_CSV.pl
dbd_csv_2tables.pl
mytable
my_db.txt
my_db_2.txt
name_cols_csv.pl
o33.csv
o33.txt
o44.txt
o55.csv
placeholder.pl
pmonk814937.pl
selectall_hashref.pl
test1.txt
test_class_csv.pl
text_csv.pl
using_DBD_CSV.pl
zip_codes.csv

C:\Old_Data\perlp>

[download]
-f doesn't get all the files that ! -d does.

In reply to Re^2: Scanning a directory's files for readability by Cristoforo
in thread Scanning a directory's files for readability by Phoebus2000

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