l i n u x - u s e r s - g r o u p - o f - d a v i s
Next Meeting:
July 7: Social gathering
Next Installfest:
Latest News:
Jun. 14: June LUGOD meeting cancelled
Page last updated:
2001 Dec 30 17:07

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

Report this post as spam:

(Enter your email address)
[vox-tech] How to check for data coming in STDIN
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[vox-tech] How to check for data coming in STDIN

  • Subject: [vox-tech] How to check for data coming in STDIN
  • From: "Jay Strauss" <jjstrauss@yahoo.MAPScom>
  • Date: Wed, 20 Jun 2001 15:48:06 -0700

In perl, if I have a pgm:

while (<>) {
    print "this is the line: $_";

normally I'd invoke the pgm like:

echo "repeat this line" | ./pgm

But if I accidentally invoke it like:


How would I prevent the while loop from running (i.e. pseudocode):

while (<>) if (exists <STDIN>) {
    print "$_";

Jay Strauss

Do You Yahoo!?
Get your free @yahoo.com address at http://mail.yahoo.com

LUGOD Group on LinkedIn
Sign up for LUGOD event announcements
Your email address:
LUGOD Group on Facebook
'Like' LUGOD on Facebook:

Hosting provided by:
Sunset Systems
Sunset Systems offers preconfigured Linux systems, remote system administration and custom software development.

LUGOD: Linux Users' Group of Davis
PO Box 2082, Davis, CA 95617
Contact Us

LUGOD is a 501(c)7 non-profit organization
based in Davis, California
and serving the Sacramento area.
"Linux" is a trademark of Linus Torvalds.

Sponsored in part by:
Sunset Systems
Who graciously hosts our website & mailing lists!