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except the home directory all the other folders that is /sbin /lib /opt
etc was moved to /home/username.Now i am unable to execute any command.
I also tried to set the PATH and LD_LIBRARY_PATH to the newly copied localtion but none of the command works. Since "mv" command also not working i am unable to change the location. Pls let me know if somebody has a solution for this.
Refer to the commands you need by the full path name. Thus instead of mv, use /home/username/bin/mv
So, for instance, to move /home/username/usr back to /usr, use
/home/username/bin/mv /home/username/usr /usr
and that should put it back for you.
PS: I've done things like that too. Once managed to move all of /usr/bin into /usr/local/bin. I recovered by cd'ing into a backup directory, then deleting /usr/bin and /usr/local/bin, and copying everything back into them out of the backup.
will give the same result.
You can try to give the whole path to the mv command
The point I'm trying to make is that when logged in as root its easy to make such a mistake - vs sudo where you are forced to enter your password and thus this reminds you that you're running a priveleged (and potentially dangerous) command.
Not saying this will stop beginner's from making mistakes - but just another way you can protect against doing stuff that will destroy a system