If I ran this command
#fsck
without arguments or options. Will it delete everything?
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Did you read the [manual page](http://linux.die.net/man/8/fsck)? – Frédéric Hamidi May 31 '13 at 09:29
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No i didn't. I wanted to check file system. I searched and found this command and just ran it. – user2164574 May 31 '13 at 09:33
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1well, be happy that nothing have seemed to have happened, and from now on, read the man pages on whatever command you copied from the internet. – Femaref May 31 '13 at 09:35
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Normally, fsck will not cause any harm, unless you try to run it over mounted filesystem.
fsck over mounted filesystem will ask you if you want to proceed. And if you force it to proceed, then it is most likely to be very destructive. I have seen other people to use fsck this way and completely thrash Linux to the point that reinstall was necessary.
mvp
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When I ran it, no prompt showed up. After that I go to the root directory and found that there is no file or directory. – user2164574 May 31 '13 at 09:37