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Today I Learned
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linux
boot zfs root filesystem on grub
clearing up swap space
connect bluetooth device from cli
get full argument from a process
merge multiple pdf into a single file
removing old kernel
symbolic vs hard link
zfs auto snapshot
zfs external backup drive with snapshot and encryption
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clearing up swap space
WARNING: make sure the memory is enough to put the data back from swap, else system will start killing processes
To clear up swap space (put the data back into memory) we can do
# swapoff -a && swapon -a
Because this is quite slow process, it's a good idea to run this inside screen session.
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