thanks! but it's unclear how to tell it lives in RAM...
Filesystem Size Used Avail Use% Mounted on
tmpfs 1,6G 2,2M 1,6G 1% /run
tmpfs 7,8G 1,5G 6,3G 19% /dev/shm
tmpfs 5,0M 8,0K 5,0M 1% /run/lock
tmpfs 1,0M 0 1,0M 0% /run/credentials/systemd-journald.service
tmpfs 1,0M 0 1,0M 0% /run/credentials/systemd-resolved.service
tmpfs 7,8G 236M 7,5G 3% /tmp
tmpfs 1,6G 11M 1,6G 1% /run/user/1000