Don't put space between file descriptor and redirection char.

That linux has the weirdest bugs ever.

Youtube comment sections have vanished. But only in Chrome and SeaMonkey. Still works fine in PaleMoon. <scratching head>

That it is trivial to set up 2FA for ssh with google-authenticator.

The select command in ksh

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I dont know if this the right place to do a complaint about the new Gimp in 20.04.But it was fine in 18.04,but a lot off things i could do in 18.04 are changed and i cant see how i can change my way of use to the 20.04 Gimp.

I do that with all system config files. The first time I modify one, I make a copy with a .orig suffix. That serves two useful purposes: I can always do a complete reset if I need to, and I can see at a glance which files have been modified by hand.

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The find command can search for files between dates!

find [source_dir] -type f -name "a*.txt" -newer /tmp/start -not -newer /tmp/end

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@hazel. etckeeper is the first thing I install and configure on every system maintained by me.

I recently learned recovering deleted files with 'testdisk'

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Ha! There, now that I have your attention I will share what I learned about Linux this week. I am sorry to say that I was using Windows as it was the only thing ready to go at my buddy's man cave, and it SUCKED!!! I spent more time waiting for the wheel to stop spinning, closing stupid advertisements from the bloatware, and fighting with an absolute POS that I said "BLEEP This!" I need my Linux live USB3 flash drive. I went to the car, grabbed the O'Fathful Linux Mint ran back in and it loaded into what little RAM this laptop had and I was off and running.

I learned that Linux is smart enough to stick with the "K.I.S.S" development mindset so that there is some version that will work on "it" , whatever "it" may be.

I'm new, but I'm loving it. There's no turning back now folks!!!
"
Take care everyone, be smart, safe, and simple. (like me) "durf"
Thank you all for making this old bleeper excited to learn again.
~Corey (Psychodrum)Drummer for PSYCHOSIS, NH , MASSACRE RECORDS, Germany. 1995-2000

I just learned that GCC now has support for profile guided optimization (PGO) already available. It was a good idea for me to re-read the GCC Info page from cover to cover, after all. The last time I read the manual in that much detail, it was for version 4.4! I just read the manual for 10.2.0.

After 20 years of using GNU/Linux I recently discovered how to clear my terminal screen by pressing Ctrl+L.

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Wow, that's useful. I always did it with clear before but this is faster.

wow! I've been typing clear and hit enter. That's even better.

Here's one that I learned from a book but if I don't use it often it takes me a few tries to get it right.

I like to keep a lot of mount points in /media/ so I can mount thumb drives quickly and easy to navigate to in the terminal.

Ubuntu will have a thumb drive mounted automatically at /home/user/media/7894-5467-4567-HI12 or worse.

So.... sudo mkdir /media/sda{1..8}

will create 8 sda mount points 1 thru 8 just like that in /media. Some systems use /mnt like Arch.
Then I change to sdb, sdc, sdd and sde and I've created 40 mount points in about 1 minute.

Then sudo mount /dev/sdc1 /media/sdc1
and then to unmount a bunch of points at once
sudo umount -a and sudo shutdown now turns the PC off.

I discovered the tac command this week which is reverse cat. I also discovered that grep has -m NUM or --max-count=NUM to stop reading after NUM matching lines.

I needed to scan large Apache log files for the most recent request for a specific page. tac starts at the last line and reads up and pipe to grep with -m1 stops after the 1st match.

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