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ls | grep -v 4 | xargs rm -rf

-v is the invert match and it will ignore filename/foldername when we do grep.

history command will not work... By default history is set to display only last 20 commands... Any other way ??

Is there any way to know, what I have executed on UNIX Command prompt from last 2-3 days ?

One more point, some systems are interconnected, is there any way to know, who others have executed what...