From: A. Mahendra Rajah (Mahendra.Rajah@URegina.CA)
Date: Wed Oct 05 2005 - 14:07:39 EDT
I asked why the following Perl statements would not produce
the text file as desired using lynx:
@Cmd = ($LYNX, "-cfg=$LYNX_CFG", "-dump ./$HTMLfile >| $TXTfile");
$Stat = system(@Cmd);
My thanks to these folks for taking the time to reply:
Charles Ballowe
"J.A. Gutierrez"
Dr. Tim Cutts
"Farmer, John"
The following email from Dr Tim Cutts gives the complete answer
to my problem:
...................................................................
$Cmd = "$LYNX -cfg=$LYNX_CFG -dump ./$HTMLfile > $TXTfile";
$Stat = system($Cmd);
Would work. >| doesn't mean anything in bourne shell syntax,
which is what system() uses. Secondly, you can't use shell
metacharacters if the arguments to system() are a list, because
in list form, it just calls exec(2), and no intervening shell,
so what would happen in your code is that lynx would be called
with two arguments
'-cfg=something'
and
'-dump ./something_else >| something_again'
Which it probably doesn't understand. See the perlfunc manpage
entry for system, and also look at the manpage for the exec(3)
C-library function, which will help you understand when an
intervening shell is used and when it isn't.
...................................................................
Thanks again for everyone who answered.
-- mahendra
................................................................
A. Mahendra Rajah Email: Mahendra.Rajah@URegina.CA
Tru64 UNIX Systems Manager Phone: (306) 585-4496
Dept. of Computing Services FAX: (306) 337-2324
University of Regina,
Regina, Sask., S4S 0A2
Canada.
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