in reply to detecting a pipeline on STDIN
-p STDIN should tell you if STDIN is a pipe. The filetest operators are described in perlfunc.
--- print map { my ($m)=1<<hex($_)&11?' ':''; $m.=substr('AHJPacehklnorstu',hex($_),1) } split //,'2fde0abe76c36c914586c';
In Section
Seekers of Perl Wisdom