tail the output and run another script without forking

[max1x]

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]

why not use multiple system calls instead of trieng to pipe them all?

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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]

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]

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 ?



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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]

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.