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I am working on my project using network simulator2.I installed it and everything is fine.The symbolic link created to use the command ns of the installed application is

$ sudo ln -s /home/vinaychalluru/ns-allinone-2.34/ns-2.34/ns /usr/bin/ns

I came to know that trying to create a new symbolic link with name ns gives

ln: creating symbolic link '/usr/bin/ns': File exists

How can i delete the already created symlink or can I replace it with any other commands?

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I was trying to do sudo ln -s destination source, and of course it bugged. Thanks for the answer. –  toonhao Jun 7 '13 at 21:59

4 Answers 4

up vote 12 down vote accepted
sudo rm -r /usr/bin/ns

sudo ln -s /home/vinaychalluru/ns-allinone-2.34/ns-2.34/ns /usr/bin/ns
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the above fails if ns is a folder - in which case use the rm -rf (recursive force switches) - in which case you might as well use the -sf switches for ln. –  finley Nov 15 '10 at 13:26
@finley Yes, you are right. Incase ns is a folder, it can't be deletd. It is now ambiguos to me that, can we create a symbolic link to a folder.? –  Vinay Challuru Nov 15 '10 at 13:41
yes, we can create a symbolic link to a folder. If it's a folder, you can do: sudo rm -r /usr/bin/ns –  Paweł Karpiński Nov 15 '10 at 13:54
@Pawel I created a symlink to folder succesfully. I can even remove as u said above. But, when i type fold [created symlink for a folder] name in terminal it gives an error. What i actually thought was by creating a symlink to a folder and just typing the link name terminal would open that in nautilus. I am not sure whether it is possible or not..? –  Vinay Challuru Nov 16 '10 at 5:16
@Vinaychalluru if you want to open that folder, try typing: cd fold - it will open in a terminal. If you want to open it in nautilus, type: nautilus fold –  Paweł Karpiński Nov 16 '10 at 6:13

ln has an -f switch that 'forces' a sym link to be created whether it exists or not.

sudo ln -sf /home/vinaychalluru/ns-allinone-2.34/ns-2.34/ns /usr/bin/ns
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I tried ln -sf while replacing but it didn't work for me, but doing ln -sfn directory link_name as root worked.

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To add to all answers above, a symbolic link can be treated as a regular file in many cases (the link, not the target).

rm on a symbolic link will remove it. If the link is owned by root, you will need to sudo.

You should be able to rm /usr/bin/ns or rather sudo rm /usr/bin/ns don't forget ownership.

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