Question

If I have this perl app:

print `someshellscript.sh`; 

that prints bunch of stuff and takes a long time to complete, how can I print that output in the middle of execution of the shell script?

Looks like Perl will only print the someshellscript.sh result when it completes, is there a way to make output flush in the middle of execution?

Answer 1

What you probably want to do is something like this:

open(F, 'someshellscript.sh|'); while (<F>) {     print; } close(F); 

This runs someshellscript.sh and opens a pipe that reads its output. The while loop reads each line of output generated by the script and prints it. See the open documentation page for more information.