====Monter un dossier sur un autre====
Monter un dossier possédant le contenu (''~/info/distfiles'' ici) vers un dossier vide (''/usr/portage/distfiles'' ici) qui sera alors un lien vers le dossier possédant le contenu.

  mount -o bind ~/info/distfiles /usr/portage/distfiles

[[https://unix.stackexchange.com/questions/198590/what-is-a-bind-mount|What is a bind mount?]] {{ :cmd:mount:filesystems_-_what_is_a_bind_mount_-_unix_linux_stack_exchange_2020-04-27_10_06_58_am_.html |Archive du 25/04/2015 le 27/04/2020}}

Et dans ''/etc/fstab''

  /home/name/info/distfiles   /usr/portage/distfiles  none    defaults,bind  00

[[https://serverfault.com/questions/613179/how-do-i-do-mount-bind-in-etc-fstab|How do I do 'mount --bind' in /etc/fstab?]] {{ :cmd:mount:unix_-_how_do_i_do_mount_--bind_in_etc_fstab_-_server_fault_2020-04-27_10_07_06_am_.html |Archive du 16/07/2014 le 27/04/2020}}

====Impossible de remonter en lecture seule====
Message type :
  mount: / is busy

Pour trouver les coupables, il faut lancer la commande :
<code bash>
lsof / | awk '$4 ~ /[0-9].*w/'
</code>

[[https://unix.stackexchange.com/questions/42015/mount-is-busy-when-trying-to-mount-as-read-only-so-that-i-can-run-zerofree|“mount: / is busy” when trying to mount as read-only so that I can run zerofree]] {{ :cmd:mount:ubuntu_-_mount_is_busy_when_trying_to_mount_as_read-only_so_that_i_can_run_zerofree_-_unix_linux_stack_exchange_2020-04-27_10_07_13_am_.html |Archive du 30/06/2012 le 27/04/2020}}