Symbolic link


 
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# 1  
Symbolic link

Hi, trying to understand more about symblic link, when I compiled a program called "match" in one folder
Code:
~/downloadsoftware/

I want this program to be accessible like a system command by putting a symbolic link in
Code:
 /usr/bin/

Not by setting the $PATH method in .bashrc at this time.
What I did is:
Code:
$~/downloadsoftware/match> sudo ln -s match /usr/bin/match

I was hoping to create the command match in /usr/bin/. The fact is the link is there but not executable as in the local folder: ~/downloadsoftware/match which is executable. When I tried:
Code:
$>which match
$>

It shows nothing but match is in /usr/bin/. If I go to /usr/bin/ and do
Code:
$/usr/bin> sudo ln -s ~/downloadsoftware/match match
$>which match
$>/usr/bin/match

Why is it like this? I thought
Code:
ln -s /path/to/source/file /path/to/destination/file

should work for any circumstances. What did I miss? Thank you!
# 2  
Do
Code:
ls -l /usr/bin/match

to see what you have done.
The /path/to/source/file must be absolute or relative to the /path/to/destination/.
Code:
ln -s match /usr/bin/match

would be relative to /usr/bin/ i.e. point to itself.
Code:
cd /usr/bin
ln -s ~/downloadsoftware/match match

or
Code:
ln -s ~/downloadsoftware/match /usr/bin/match

is correct, because the /path/to/source/file is absolute.
This User Gave Thanks to MadeInGermany For This Post:
# 3  
Thanks!
I did noticed sometimes that ls -l indicated the link is actually pointed to itself. It seems to me the trick is this statement
Code:
The /path/to/source/file must be absolute or relative to the /path/to/destination/.

but the man page does not provide enough information about this. More care should be taken next time to create a soft link. Thanks a lot!
# 4  
The trick is, for symlinks, ln takes the path completely literally.

So if you do
Code:
ln -s ../whatever path/to/linkname

You might expect a link to ../../../whatever, since it's more folders up, right?

Nope, it just gives a link pointing to the path ../whatever. It doesn't extend it for you.

If you give it an absolute path, it can't make this mistake.

Last edited by Corona688; 02-06-2013 at 04:05 PM..
This User Gave Thanks to Corona688 For This Post:
# 5  
I think my misunderstanding is the relative path was assumed OK, and was used.
 

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