Desde la página de manual de BSD:
-f If the target file already exists, then unlink it so that the link
may occur. (The -f option overrides any previous -i options.)
-n If the target_file or target_dir is a symbolic link, do not follow
it. This is most useful with the -f option, to replace a symlink
which may point to a directory.
el -n opción (junto con -f ) fuerza ln para actualizar un enlace simbólico a un directorio. ¿Qué significa eso?
supongamos que tiene 2 directorios
- fu
- barra
y un enlace simbólico existente
- baz -> barra
ahora quieres actualizar baz señalar a foo en cambio. si lo haces
ln -sf foo baz
obtendrías
- baz/foo -> foo
- baz -> bar (sin cambios), y por lo tanto
- bar/foo -> foo
si agrega -n
ln -sfn foo baz
Consigues lo que quieres.
- baz -> foo
eso es lo que significa 'no-dereference':no resuelva un enlace existente y coloque el nuevo enlace dentro de ese directorio, sino simplemente actualícelo.
Aquí están todas las opciones para ln. Encontrarás -n y -f aquí.
-F If the target file already exists and is a directory, then remove it so that the link may occur. The -F option should be used with either -f or -i options. If none is specified, -f is implied. The -F option is a no-op unless -s option is specified. -h If the target_file or target_dir is a symbolic link, do not follow it. This is most useful with the -f option, to replace a symlink which may point to a directory. -f If the target file already exists, then unlink it so that the link may occur. (The -f option overrides any previous -i options.) -i Cause ln to write a prompt to standard error if the target file exists. If the response from the standard input begins with the character `y' or `Y', then unlink the target file so that the link may occur. Otherwise, do not attempt the link. (The -i option overrides any previous -f options.) -n Same as -h, for compatibility with other ln implementations. -s Create a symbolic link. -v Cause ln to be verbose, showing files as they are processed.