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Old 01-13-2021, 12:15 PM   #1
jeremy
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Registered: Jun 2000
Distribution: Debian, Red Hat, Slackware, Fedora, Ubuntu
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What is something *new* you have learned about Linux within the past 7 days?


Based on this thread, here's a sticky for you to highlight something you've learned about Linux in the last 7 days. This is a great way to learn from follow LQ members and share what you've recently learned.

Hat tip to @KGIII for starting the original thread.

--jeremy
 
Old 01-14-2021, 03:06 AM   #2
MadeInGermany
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Registered: Dec 2011
Location: Simplicity
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I learned two commands to view I/O per process:
iotop and
pidstat
 
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Old 01-19-2021, 02:06 AM   #3
Spidrena
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Registered: Oct 2018
Location: Schilde, Belgium
Distribution: Linux Mint, KDE neon, Ubuntu, MX-Linux
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Use dpkg to manage packages.
 
Old 01-19-2021, 08:03 AM   #4
hish2021
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Registered: Jan 2021
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That I can use
Code:
${i8k_cpu_temp}
on my Dell laptop's conky instead of something like
Code:
${hwmon 2 temp 1}
and having to change sensor number ever so often.
 
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Old 01-27-2021, 04:29 AM   #5
Arct1c_f0x
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Registered: Feb 2020
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I learned that you can use the host command like this:

Code:
host youtube.com
and it spits out network information about the site to stdout
 
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Old 01-27-2021, 11:42 AM   #6
KDSR
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Registered: Jan 2021
Location: Tucson
Distribution: Slackware
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Machine Code...

Most People don't realize that Linux includes NASM..
Code:
/usr/bin/nasm
Code:
section .data
	hello:     db 'Hello world!',10    ; linefeed character
	helloLen:  equ $-hello             ; Length of the string
	                                   ; 

section .text
	global _start

_start:
	mov eax,4            ; Call for write (sys_write)
	mov ebx,1            ; File descriptor 1 - standard output
	mov ecx,hello        ; Put the offset of hello in ecx
	mov edx,helloLen     ; 
	                     ;  
	int 80h              ; Call the kernel

	mov eax,1            ; Call for exit (sys_exit)
	mov ebx,0            ; Return code of 0 (no error)
	int 80h
 
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Old 01-27-2021, 12:43 PM   #7
igadoter
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youtube-dl still alive.
 
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Old 01-27-2021, 03:38 PM   #8
dc.901
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rpm command to view changelog of a package...

Did this to determine if an update is applied to address a CVE.

Here's an example:

Code:
# rpm -q --changelog sudo | grep -i CVE-2021-3156
- fixed CVE-2021-3156 sudo: Heap buffer overflow in argument parsing
 
Old 01-27-2021, 03:57 PM   #9
rokytnji
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Registered: Mar 2008
Location: Waaaaay out West Texas
Distribution: AntiX 19
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That all hope is not lost converting my Samsung Chromebox series 3 stumpy board write protect pins to being shorted so I can change bios and install Linux.

That microsoft laptop sales went down for the 1st time ever because of chromebooks and covid stay at home requirements.

So I figure I better learn their hardwere hoops I might have to jump through.


For the command stuff. I like

https://github.com/smxi/inxi

That script is pretty useful for my needs.
 
Old 01-31-2021, 08:26 PM   #10
Gemu
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Registered: Nov 2017
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Type passwd in a terminal, then current password, then new to change an obnoxious long login and root password.

I had to relearn this one after some fresh installs on a new hard drive. Love the new look of Mint 20.04, ubuntus about the same.

Type in sudo visudo and type in
NOPASSWD:ALL at the bottom where it says root, group and users to get rid of the terminal password request.

I have learned that linux does not easily grab files off Windows 10 hard drives like the good old days. You have to jump through some whoops now and I havent found them yet.

I've learned that the best multiboot linux USB/ windows live/ tools can be made with YUMI on Windows 10, 8 or 7.
You can put 5 iso's on a USB that will actually boot faster than you can download them.
Years ago I spent more than a weekend trying to get a Knoppix 5.1 USB poor mans install to boot. I never did get it with Syslinux but did with grub legacy.

Last edited by Gemu; 01-31-2021 at 08:33 PM.
 
Old 01-31-2021, 09:12 PM   #11
KDSR
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Registered: Jan 2021
Location: Tucson
Distribution: Slackware
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windows rescue..

The Admin and User passwords got corrupted on my Girlfriends Windoze laptop, so I booted it with a USB stick installed with Slackware Live 14.2 and renamed the .sam files so she could login and set new passwords... "Do Not, I repeat.. Do Not get caught booting someone's computer like this Without their Permission!
 
Old 01-31-2021, 11:10 PM   #12
igadoter
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It is important to have good knowledge about installer and package management system.
 
Old 02-01-2021, 07:41 AM   #13
hazel
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Quote:
Originally Posted by Gemu View Post
Type in sudo visudo and type in
NOPASSWD:ALL at the bottom where it says root, group and users to get rid of the terminal password request.
That removes a safety feature in that anyone who finds you logged in can carry out commands as root while you are out of the room. Also, if anyone online obtained access to your account, they would effectively be root without needing to know your password. It's your choice but I wouldn't do it.
Quote:
I have learned that linux does not easily grab files off Windows 10 hard drives like the good old days. You have to jump through some hoops now and I havent found them yet.
The kernel can read ntfs filesystems but can't write to them as it could to fat filesystems. You need to install ntfs-ng.
 
Old 02-01-2021, 07:50 AM   #14
boughtonp
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Registered: Feb 2007
Location: UK
Distribution: Debian
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Quote:
Originally Posted by hazel View Post
That removes a safety feature in that anyone who finds you logged in can carry out commands as root while you are out of the room.
I used to work at a place where anyone who left their machine logged in and unattended found an embarrassing chat/email message being sent on their behalf.

It was a pretty effective measure to get people to always lock their machines.

 
Old 02-03-2021, 04:54 PM   #15
jerril
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Registered: Nov 2005
Location: Ontario, Canada
Distribution: Linux Mint
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PSA: I'm embarrassed to bring it up, because it's a lesson I've learned the hard way too many times: backup your init before you modify.
 
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