Today I was reading some posts/news in efytimes.com, in that I found one post useful post, and felt it's good to post here so that if any more such commands are there then we can discuss.
Here is that useful post
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rm -r is an old chestnut.
ifconfig -a 1 has a surprising impact - at least on Solaris.
Also good on Unix: crontab . Hanging. Now don't terminate with ^D, this will wipe the crontab. Dito with ^C on some buggy implementations.
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I remember when I was at university the text editor we were taught to use saved backup files as filename+ampersand. You can guess how that went if you were slightly careless when cleaning up old backups...
A good lecture! At least your backup files were retained...