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create a symbolic link in Terminal?

ln -s /path/to/original /path/to/symlink

// or to use echo use the commands below

$ echo content > original
$ ln -s original symlink
$ ls -la original symlink
-rw-r--r--  1 admin  staff    8 28 Mar 10:04 original
lrwxr-xr-x  1 admin  staff    8 28 Mar 10:04 symlink -> original
$ cat symlink


To create a symlink to replace the system directory, you have to disable System Integrity Protection. And you then can re-enable it after the symlink is set up.