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I tried tee but its not able to write to the combined.log as its already opened by the main.sh.

Unfortunately I cannot as main runs so many number of times in a day. I have every log file named as main_$now.log and child as child_$now.log where now is date + %ymdhms% format.

Here is what I have.
1 main program and it calls several child programs. Each child has its own log file. I want all child logs also to be appended to the main.log so that I have a single log file....