symlink confusion

Bruce Labitt bruce.labitt at myfairpoint.net
Sat Nov 14 13:01:43 EST 2015


On 11/14/2015 12:36 PM, Kyle Smith wrote:
> I like to remember it as:
>
> ln -s thing-I-want-a-symlink-to where-I-want-to-put-it
>
> It's helps to remember, too, the reason for the order is that the 
> second option isn't required. It will put a symlink with the same base 
> name in your current working directory without it.
> On Sat, Nov 14, 2015 at 12:31 PM Bruce Labitt 
> <bruce.labitt at myfairpoint.net <mailto:bruce.labitt at myfairpoint.net>> 
> wrote:
>
>     Confused about this, so I'd like to ask, before I mess things up. 
>     I am attempting to follow the instructions on
>     http://askubuntu.com/questions/693145/installing-cuda-7-5-toolkit-on-ubuntu-15-10
>
>     I'd like to create a symbolic link from cc (which is a symlink) to
>     /opt/compiler_cuda/gcc
>
>     |cc -> /opt/compiler_cuda/gcc
>
>     |So the command should be:  sudo ln -s cc /opt/compiler_cuda/gcc
>     ?  Or reverse the arguments?
>
>     Sorry about this primitive question, sometimes I get confused
>     about the order.  As I have found online, the description is
>     ln -s /path/to/file path/to/symlink.  However, this still confuses
>     me.  Which is which in my example?
>
>     Can someone enlighten me?  TIA.
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>

Pardon my denseness (density?), but what you have shown is still 
confusing to me.

ln -s thing-I-want-a-symlink-to where-I-want-to-put-it  <-- I don't 
understand this :(

In my case, I want any reference to cc to point to 
/opt/compiler_cuda/gcc.  It turns out /opt/compiler_cuda/gcc will be a 
symlink as well.  Eventually the cc reference will end up pointing to 
gcc-4.9, since CUDA7.5 does not support gcc5.

Is it
1)  ln -s cc /opt/compiler_cuda/gcc      or
2)  ln -s /opt/compiler_cuda/gcc cc

Which one does what I want?  Seriously confused.

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