How to make a symbolic link to /bin in /nas/users/foo directory?
You need to use the ln comand make links between files. In this example create a a symbolic link to /bin as /nas/users/foo/bin, enter:
cd /nas/users/foo/ ln -s /bin .
OR use a single command as follows:
ln -s /bin /nas/users/foo/bin
To verify your settings type:
$ ls -l
$ ls -ld bin