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radoulov,
You are very knowledgeable.
nawk 'x&&!--x;/error/{x=3}' file
is what I needed.:)
Thank you.

Using shell scripts, I use grep to find the word “error” in a log file:
grep error this.log.
How can I print or get the line 3 lines below the line that word “error” is located?
Thanks in advance...