I'm trying to create a symbolic link which would be system-wide usable.The $PATH output is the follow: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games So I don't understand why if I create a sl for example in /bin this symlink only works from inside the /bin directory and not from others directories.For example:# cd /bin # ln -s /media/bc7bc3eb-4ba9-4c12-8066-5f2e9ea747ec/SharedHOME/ ./shome
System wide symbolic link
symlink
The $PATH environment variable is only used when you run an executable.In your case, you've symlinked a directory.  As a directory isn't an executable, then your shell will not search $PATH for it.If you symlink to an executable, you'll find that it works as expected.