perlapi| perldoc.perl.org
#_exit| perldoc.perl.org
perlport| perldoc.perl.org
perllocale| perldoc.perl.org
perl| perldoc.perl.org
perlunicode| perldoc.perl.org
feature| perldoc.perl.org
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perldata| perldoc.perl.org
A file test, where X is one of the letters listed below. This unary operator takes one argument, either a filename, a filehandle, or a dirhandle, and tests the associated file to see if something is true about it. If the argument is omitted, tests $_, except for -t, which tests STDIN. Unless otherwise documented, it returns 1 for true and '' for false. If the file doesn't exist or can't be examined, it returns undef and sets $! (errno). With the exception of the -l test they all follow symbol...| perldoc.perl.org
Ah, strings, the inexhaustible cornucopia of programming tasks. I found this week's challenges easy,...| DEV Community
#-0[octal/hexadecimal] | perldoc.perl.org
perlop| perldoc.perl.org