Thank you. Going to found a solution out of the pipe.
Possibly reading the second file before the tail command. So I store results in an array to scan in the second pipe.

Giuseppe

@Guiseppe

Sorry for the delay, but i hope this method with help solve your problem.

Try to use the approach of an Awk script as follows:

tail -f /opt/red5-server108m2/log/red5.log | awk -f script.awk file

put awk command in script.awk and use the -f option to read the script as in the command above.

script.awk

————————————————————————————–
#!/bin/awk -f

‘{if (/Stream start:/){

*insertion point*

}

Check this guide for more information: https://www.gnu.org/software/gawk/manual/html_node/Naming-Standard-Input.html

Hello Mr. Kili, you are correct. In that point marked I want sto scan a second text file where a list of user is stored. So if user is present the stream can start else not.

Have a good day, Giuseppe

You are welcome @Giuseppe

If i got the question right, i suppose you want to parse another file then search for a name in that file. The difficulty is therefore reading input from a second file apart from piped input.

Let me look into the problem and figure out the solution, it will require a little time. I hope you can wait a little more, after all the solution is the most important.

Thank you for fast, kind and comprensive reply to an old noob 60 years old.
Now I begin to write some simple code about strings operation.

Have you some gift for the 1st question?

Giuseppe