Sara

oh also mods can we pin this therad. is shell even worth bothering with or should i just leave it

package caches are safe to clear: sudo apt clean on Debian/Ubuntu or sudo dnf clean all on RHEL family. Old kernels can also take space: sudo apt autoremove purge.

hmmmm quick q which version are you on? ?

ok so if you deleted a big file and df didnt change, a process still has it open. sudo lsof +L1 lists deleted but open files. Restart that service, or truncate instead of deleting next time: sudo truncate s 0 /var/log/big.log.