This is great: How to write idempotent Bash scripts. Some highlights for me were `blkid` and `mountpoint`.
I tried to run `chromium` on my Kubuntu 20.04.3 LTS workstation and got the following error:
Snap-confine has elevated permissions and is not confined but should be. Refusing to continue to avoid permission escalation attacks
I found this and this worked for me:
systemctl enable --now apparmor.service systemctl enable --now snapd.apparmor.service
This is an excellent article, I only wish I had time to read it: So you want to build an embedded Linux system?.
“An oscilloscope is essentially a sensitive auto-ranging voltmeter.”
The EEVblog guys over on Are Mixed Signal (MSO) Oscilloscopes Worth The Money? says that no, they’re probably not. They are, however, “the duck’s guts”. :)
Been pottering in my lab:
I have this USB Logic Analyzer which I want to test:
Figured this was a great chance to try out my new XR2206 function generator:
Hmm. Needs power! The XR2206 datasheet said it could support a wide supply range, from 10V to 26V. Figured this was a good chance to try out my new ATX power break out board:
I need a power cable from round lugs on the ATX supply:
connected with a good length of wire:
and professionally finished with heat-shrink tubing:
had to break out my soldering station:
and make myself a power cable:
to connect the ATX power supply:
to the function generator:
Testing the logic analyzer can wait for another day. :)
Have just discovered EEVblog with this one: EEVblog #652 – Oscilloscope & Function Generator Termination Demo. Interesting stuff! Tip: always use a x10 probe.
Today I found: Checking ashift on existing pools. In summary:
# zpool get all | grep ashift # zpool get all | less # zdb -C | grep ashift # zdb -C | less # zdb -U /etc/zfs/zpool.cache | less
Per ZFS 101—Understanding ZFS storage and performance you *really* want to make sure your ashift value is aligned with your disk’s sector size. ashift=9 for 512; ashift=12 for 4096; I’ve heard some SSDs can be 8K, but I haven’t been able to confirm for my own disks.