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the commands which i executed are
cd /
rm -rf *
how can i recover from this
Restore the system from the last full tested backup. After that ask a senior to change the root password on the machine and configure the appropriate sudo entries for you.
..or Photorec. And this may sound harsh but in case you don't have a backup now you know why you should have. Besides, some people just have to learn not to fat finger stuff or think about what they do (what's a reboot gonna fix?) the hard way.
Oh, it can indeed be a "fat finger." I once watched someone starting to type, "rm -rf /*something", got as far as "rm -rf /*", then thought better of it and reached for the backspace key. Those oversized, backward "L" shaped <enter> keys come up awfully close to the backspace key.
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