linux - stream output of a command continuously run in php -


i running simple command 

{ ./a.out < in; } &> output.txt
using exec , want output what's coming in output.txt through ajax request continuously.
also want way turn off output buffering.i tried flush() , ob functions didn't succedded.in 
/etc/php5/apache2/php.ini  php.ini
value of 
output_buffering = 4096 error in log file is: [sat may 31 15:48:26.853420 2014] [mpm_prefork:notice] [pid 1277] ah00169: caught sigterm, shutting down [sat may 31 17:23:30.461926 2014] [mpm_prefork:notice] [pid 1270] ah00163: apache/2.4.7 (ubuntu) php/5.5.9-1ubuntu4 configured -- resuming normal     operations [sat may 31 17:23:30.484232 2014] [core:notice] [pid 1270] ah00094: command line: '/usr/sbin/apache2'
.when change off , restart apache2 server fails restart.
p.s. using lamp server.


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