What is something *new* you have learned about Linux within the past 7 days?

igadoter · 06-19-2021, 12:46 PM

I laughed, sorry.

Bonzoo · 06-19-2021, 04:22 PM

I've reconfirmed that slackware is a pain and everyone who uses the garbage is here on LQ. ;-)

onebuck · 06-19-2021, 05:10 PM

Quote:

Do not post any messages that are obscene, vulgar, sexually-orientated, hateful, threatening, hostile or insulting.
Personal attacks on others will not be tolerated.

If you wish to continue posting here on LQ as a member you must cease your posting style. You have been given a infraction for violation of LQ Rules

!!! · 06-19-2021, 05:39 PM

I finally just now ddGoo'ed (web-researched) up my mll dream of:
pasting into the (NoGUI) console of a VirtualBox guest (even M$Dos)
(&without getting flamed for posting a dumb=UNddGoo'ed thread asking how!!!)

Code:

alias p='cat>p ; VBoxManage controlvm mll keyboardputfile p'

Run on VBox *host*.
Where mll is MyVmGuest's name. Note that it creates a text file in $PWD named p
Use Ctrl-D (on Vbox host, when done entering stuff to paste to guest)

Of course, you can enhance 'p'. There's also kb put string
(but I don't think[?] there's ANY bash way to ?capture? everything upto \n,
like: p hostname;uname -n #paste=execute BOTH on guest, withOUT shell quoting/escaping)

@M.Vbox (aka @sundialsvcs): IF new to you, refer to (search) VB forum 80315

I guess this would also work for pasting into grub/uefi!!!
(I'm guessing NOone thought that was even possible!!!)

(Copy: I finally realized that: there's no way [other than record video/take snapshot=picture] to Copy what video as already displayed, esp. if it already scrolled off, like a panic.)

(I run mll, so can't use 'Guest additions')

Yes, I'm probably the world's only anti-GUI cli-only 'er (except for web browser)

New 6/21 crazy=non-post-worthy idea: (since I don't believe I could simply: apt install <any of 50-100,000 .deb packages> on slackware)
wget-based getting (only static) programs (for any Linux=kernel)
p become sort of a library of static programs' binary URLs that I want to run on MLL, easily reloaded on a fresh boot of the ISO (yes, I could use the Vbox saveState or snapshots).

Code:

wget https://bitfab.org/dropbear-static-builds/dropbear-v2020.81-x86_64-static.tgz
#tar xzf ... ; mv/rm ... ; chmod 755 dropbear
echo 0::0:0::/:/bin/sh >/etc/passwd #cuz mll doesn't have!!!
(echo 0;echo 0)|passwd #force a short password of the digit 0 to the username digit 0!!!

https://www.linuxquestions.org/quest...9/#post6258552

ondoho · 06-20-2021, 02:36 AM

Quote:

Originally Posted by !!!

Code:

alias p='cat>p ; VBoxManage controlvm mll keyboardputfile p'

Run on VBox *host*.
Where mll is MyVmGuest's name. Note that it creates a text file in $PWD named p
Use Ctrl-D (on Vbox host, when done entering stuff to paste to guest)

Very cool.
Is there a way to make this go the other way round as well? I.e., from the guest to the host?

missbfbarley · 06-20-2021, 09:12 AM

I have learnt as i newbie that the more i learn the less i know.

I also learnt of recent that VirtualBox is not as good as GnomeBoxes and that VirtManager is best after trying all of them, however VirtManager is not as easy to understand the settings at first to set up properly and is somewhat distro sensitive.

hazel · 06-20-2021, 09:35 AM

Quote:

Originally Posted by dugan

I FINALLY got a good idea of what directories are: files where each line is the name of one child of that directory, and its inode.

Yes it took me this long. Don’t laugh.

I think "line" is misleading. It suggests a text list. As I understand it, the directory file contains C structures that contain a filename and an inode number plus a few other bits and pieces. The man(3) page for readdir is useful.

Geekomatic · 06-22-2021, 09:21 AM

Quote:

Originally Posted by frankhjung

The find command can search for files between dates!

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

I like to disable the M$ resource-hog-service Windows Search & replace it with Everything Search. MUCH better!

dc.901 · 06-22-2021, 12:06 PM

recently learned that in df there is "--output" option, so if you only want to see source and used columns :

Code:

df -h --output=source,used /
Filesystem      Used
/dev/sdb3       9.9G

For "Use%" column:

Code:

df -h --output=pcent /
Use%
 11%

pmv · 06-28-2021, 05:18 PM

I have changed the Unattended-Upgrade on Ubuntu from every day to 14 days:

/etc/apt/apt.conf.d/10periodic
/etc/apt/apt.conf.d/20auto-upgrades

Code:

APT::Periodic::Unattended-Upgrade "14";

"0": means is disabled

DavidMcCann · 07-26-2021, 11:23 AM

Whenever I've installed a distro, I've always set /proc/sys/vm/swappiness. I've only just learnt that the next time the computer boots, it will reset swappiness to a default

teckk · 07-26-2021, 11:44 AM

https://www.howtoforge.com/tutorial/linux-swappiness/

On arch
https://wiki.archlinux.org/title/Swap

igadoter · 07-26-2021, 01:42 PM

-nographic option for qemu
root / on overlay file system

jodytek404 · 08-02-2021, 04:45 PM

I learned how to test for an open port on a remote server using only bash.

Was like whoa wtf, is that for real?

echo > /dev/tcp/<ip address>/<port number>
echo $?

Michael Uplawski · 08-03-2021, 12:44 AM

I learned that when there is “no space left on the device”, it can mean the temporary space allocated for an initial ram-disk image, not the hard-disk. Removing old kernels helps.

Now I wonder about the percentage of problem-reports which should really be reports of misguiding program output and bad documentation.