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Home > Forums > Programmers > Languages > Perl Forum

tail the output and run another script without forking

thread219-1645821
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max1x (Programmer)
19 Apr 11 12:20
My first script creates an output file, which the second script needs to parse real-time.  Using system command, I was teeing and tailing the files as follows

system("sc1.pl | tee out1.out | tail -f out1.out | sc2.pl | tee out2.out");

Both the output files get created but are empty.  I can't install any modules on the machine I'm on so forking is not possible.  Any simple solution I'm overlooking?
travs69 (MIS)
19 Apr 11 22:33
why not use multiple system calls instead of trieng to pipe them all?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
noevil
Travis - Those who say it cannot be done are usually interrupted by someone else doing it; Give the wrong symptoms, get the wrong solutions;

max1x (Programmer)
20 Apr 11 10:54
I tried that as well.  The 1st output files starts and increments, but it's does not seem to get tailed for input for the second script.  
travs69 (MIS)
20 Apr 11 10:59
idk, what your doing just seems incorrect but maybe I don't understand.  D

o you control scp1 and scp2.  Is this a daemon of some kind or does it just run once?

If it just runs once why isn't it all in one script?

Can you just call scp1 > out1.out.
then call cat out1.out | scp2 > out2.out ?

 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
noevil
Travis - Those who say it cannot be done are usually interrupted by someone else doing it; Give the wrong symptoms, get the wrong solutions;

max1x (Programmer)
20 Apr 11 11:13
it works when I do it in a different term window.  I'm tring to do real time parsing.  The output files have rw for the users, so I don't think it's locked.
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