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Hi.

Given that information, I would try:
cp test.log back.log
sed '1,100d' test.log>temp.log
# mv temp.log test.log
cp temp.log test.log
(comment, "#", only for illustration, not needed in...

IMHO @drl's solution in post #15 nearly fulfils the requirement.

Reading between the lines, we are again presented with a faulty solution without a definition of the actual problem.

Taking...

@unoho
Sounds like your logfile is open by an application.
The usual technique when a logfile is open (like with some of the system logs) is to copy the file, then null it. This retains any file...