output to $tmp_file$$ instead and then join the tempfiles afterwars if necessary.
$$ is current pid, if you were unsure.

Update:
Ups... $$ in this case is the same always :(
use 
system("perl -e 'myscript.prl $id >> $tmp_file\$\$' &");

[download]
instead

T I M T O W T D I

In reply to Re: Writing to a file by Cine
in thread Writing to a file by jalebie

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