Clear Mikrotik Log/History

CLEAR Mikrotik LOG WINDOW HISTORY

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/system logging action set memory memory-lines=1

It will delete all previous entries.

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/system logging action set memory memory-lines=9999

It will change it back to the default number of lines. or let it set to 1 , if you dont want any info, which is not recommended in any case ?

CLEAR Mikrotik TERMINAL CONSOLE HISTORY

In newer version of mikrotik 6.x, you can clear console commands by using

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console clear-history