On Sat, Feb 26, 2005 at 11:42:15AM +0530, raghu wrote:
>
> I have a written a small perl script that fetches RSS feeds and
> dumps the output into a html file residing on the user's
> desktop.I want the script to call itself and update the html
> file periodically with new feeds.I am new to perl and this is
> my first perl program.I can use 'at' or 'cron' (on *nix) to
> automate the job but I want the script to call itself (since
> this script might be placed on a windows machine).Google search
> is going on but would appreciate if the group can point me to
> some resources on scheduling.Alternatively, I can place an
> 'update' button in the html file, which will call the perl
> script and update itself.
>
> Of course, I can use the 'at' command or the GUI based Task
> Scheduler in Winduhs, but would like a generic solution.
>
Raghu, one of the ways is to run your perl script is as a perl
'daemon' itself.
I am placing a small script below as an example. This merely
puts a time stamp every 10 seconds. Since this uses the *nix
'date' function, may not work under Winduhs, just change to
"Hello World" or something else ;-)
---------------------------<snip>--------------------------------
#!/usr/bin/perl
use POSIX qw(setsid);
# Direct everything to /dev/null (for non-interference)
open STDIN, '/dev/null' || die "ERR: read /dev/null: $!";
# open STDOUT, '>/dev/null' || die "ERR: write to /dev/null: $!";
open STDERR, '>/dev/null' || die "ERR: write to /dev/null: $!";
# Exit if already running or else setsid this script
defined(my $pid = fork) || die "ERR: Can't fork: $!";
exit if $pid;
setsid || die "ERR: starting new session: $!";
# Do the job (endless loop)
while(1) {
sleep(10);
my $tyme = `date +%H:%M:%S`;
print "Time ... $tyme \n";
}
--------------------------</snip>---------------------------------
o Uncomment STDOUT line to suppress output. It will work in
the background.
o POSIX library needed, since 'setsid' is not built-in perl
o Alter delay in the 'sleep' command within while loop.
o Instead of 'print bla bla ...' run your RSS script or you
may insert that script here (if not large). This itself
takes about 1k of memory.
o You need to 'kill pid' to stop this 'daemon' !
HTH
Bish
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