Anyone else feel like they can write a python noscript way faster than the equivalent bash solutions (sed, awk, printf, etc.)?
Often I want to do simple tasks and to challenge myself to not use python I lookup the bash solution using tools like sed, awk, printf, etc. But just getting through the bash syntax and how every tool has its quirks using different flags is very time consuming. I also find that any task that can't be expressed as a simple loop or pipeline takes exponentially more time to write.
For example, today I had a task of trimming the leading and trailing whitespace from every line of a text file. The awk answer `awk '{$1=$1}1'` is short but very non-obvious to me, and the regex sed answer `'s/^[ \t]*//;s/[ \t]*$//'` is a mess. Python string handling such as `str.strip()` by comparison is reasonable and can handle special characters like whitespace and backslash with no problem (vs. `read` and whatever `$IFS` is). And it should be no surprise to newbies that bash syntax is full of gotchas. It feels like I am working in a minefield of potentially code-breaking special characters.
[Some articles online](https://www.makeuseof.com/tag/sed-awk-learn/) say "everyone needs to know sed and awk" but is it really worth learning whole new syntaxes? I suppose I am repeating myself of https://stackoverflow.com/questions/107603/is-there-still-any-reason-to-learn-awk I think it's more worth my time to work a language I am familiar with rather than trying to make use of these tools. What do you think?
https://redd.it/f8yep4
@r_linux
Often I want to do simple tasks and to challenge myself to not use python I lookup the bash solution using tools like sed, awk, printf, etc. But just getting through the bash syntax and how every tool has its quirks using different flags is very time consuming. I also find that any task that can't be expressed as a simple loop or pipeline takes exponentially more time to write.
For example, today I had a task of trimming the leading and trailing whitespace from every line of a text file. The awk answer `awk '{$1=$1}1'` is short but very non-obvious to me, and the regex sed answer `'s/^[ \t]*//;s/[ \t]*$//'` is a mess. Python string handling such as `str.strip()` by comparison is reasonable and can handle special characters like whitespace and backslash with no problem (vs. `read` and whatever `$IFS` is). And it should be no surprise to newbies that bash syntax is full of gotchas. It feels like I am working in a minefield of potentially code-breaking special characters.
[Some articles online](https://www.makeuseof.com/tag/sed-awk-learn/) say "everyone needs to know sed and awk" but is it really worth learning whole new syntaxes? I suppose I am repeating myself of https://stackoverflow.com/questions/107603/is-there-still-any-reason-to-learn-awk I think it's more worth my time to work a language I am familiar with rather than trying to make use of these tools. What do you think?
https://redd.it/f8yep4
@r_linux
MUO
Every Linux Geek Needs to Know Sed and Awk. Here’s Why…
sed and awk are every Linux power user's favorite tools. But what are they? And how do you use them to process text files?
Flatcar Container Linux enters new era after CoreOS End-of-Life announcement
https://kinvolk.io/blog/2020/02/flatcar-container-linux-enters-new-era-after-coreos-end-of-life-announcement/
https://redd.it/f8y4vx
@r_linux
https://kinvolk.io/blog/2020/02/flatcar-container-linux-enters-new-era-after-coreos-end-of-life-announcement/
https://redd.it/f8y4vx
@r_linux
Kinvolk
Kinvolk: Flatcar Container Linux enters new era after CoreOS End-of-Life announcement
Flatcar Container Linux enters and new era after Red Hat announces CoreOS Container Linux End Of Life
Set sudo chmod 0750 on Admin.. how to undo
**Account Setup**
Account #1 Admin with username (called dumbfuck for this post)
dumbfuck is a default account, the first account created and a admin.
​
Account #2
Account #2 is a normal user account. We will call it bob.
Bob had acess to dumbfucks files.
I used THIS GUIDE
[https://www.howtogeek.com/190084/how-to-prevent-other-users-from-accessing-your-home-directory-in-ubuntu-14.04/](https://www.howtogeek.com/190084/how-to-prevent-other-users-from-accessing-your-home-directory-in-ubuntu-14.04/)
​
to remove bobs access to dumbfucks files
sudo chmod 0750 /home/bob
(normal user cannot see home directory of admin)
This is okay 👍
I then (being dumbfuck)
ran the same command on the admin account.
sudo chmod 0750 /home/dumbfuck
I want to reset the user permissions on the Admin so that the Admin can still see files.
Username dumbfuck can no longer view bobs files.
How can I fix the user account dumbfuck to have admin permissions again and re-open the directory of bob?!?
https://redd.it/f92bfy
@r_linux
**Account Setup**
Account #1 Admin with username (called dumbfuck for this post)
dumbfuck is a default account, the first account created and a admin.
​
Account #2
Account #2 is a normal user account. We will call it bob.
Bob had acess to dumbfucks files.
I used THIS GUIDE
[https://www.howtogeek.com/190084/how-to-prevent-other-users-from-accessing-your-home-directory-in-ubuntu-14.04/](https://www.howtogeek.com/190084/how-to-prevent-other-users-from-accessing-your-home-directory-in-ubuntu-14.04/)
​
to remove bobs access to dumbfucks files
sudo chmod 0750 /home/bob
(normal user cannot see home directory of admin)
This is okay 👍
I then (being dumbfuck)
ran the same command on the admin account.
sudo chmod 0750 /home/dumbfuck
I want to reset the user permissions on the Admin so that the Admin can still see files.
Username dumbfuck can no longer view bobs files.
How can I fix the user account dumbfuck to have admin permissions again and re-open the directory of bob?!?
https://redd.it/f92bfy
@r_linux
How-To Geek
How to Prevent Other Users From Accessing Your Home Directory in Ubuntu 14.04
If you share your Ubuntu machine with other people, you probably have multiple users set up, thinking that the other users log into their own accounts and only have access to their own home directories. However, by default, any user can access any home directory.
Local information disclosure in OpenSMTPD (CVE-2020-8793)
https://www.openwall.com/lists/oss-security/2020/02/24/4
https://redd.it/f8xc2q
@r_linux
https://www.openwall.com/lists/oss-security/2020/02/24/4
https://redd.it/f8xc2q
@r_linux
reddit
Local information disclosure in OpenSMTPD (CVE-2020-8793)
Posted in r/linux by u/Mcnst • 0 points and 1 comment
LFTP (or other) to copy file / directory with same command
Hello,
I think that I am not using lftp correctly.
Does it possible with lftp to use the same command to copy file or directory ? Actually I am doing a simple mput when it's a file and mirror when it's a directory.
I would like to use a noscript which send automatically files or directory to my personnal NAS. More precisely, when my download on Deluge is over, Execute a noscript to direct copy the fresh downloaded files/directory. But sometimes it's just a standalone file or sometimes it's a directory with sub directories
I don't find the correct syntax, i could write an IF statement but maybe we can find something more easiser and proper
If I have to use an other tool than LFTP, no problem for me ! Indeed, the best way will be a web interface to manage transfert from my Seedbox to multiple destination. Actually, I have to modify my noscript for each download depends if it's a file, directory and destination.
​
Thanks,
https://redd.it/f9854m
@r_linux
Hello,
I think that I am not using lftp correctly.
Does it possible with lftp to use the same command to copy file or directory ? Actually I am doing a simple mput when it's a file and mirror when it's a directory.
I would like to use a noscript which send automatically files or directory to my personnal NAS. More precisely, when my download on Deluge is over, Execute a noscript to direct copy the fresh downloaded files/directory. But sometimes it's just a standalone file or sometimes it's a directory with sub directories
I don't find the correct syntax, i could write an IF statement but maybe we can find something more easiser and proper
If I have to use an other tool than LFTP, no problem for me ! Indeed, the best way will be a web interface to manage transfert from my Seedbox to multiple destination. Actually, I have to modify my noscript for each download depends if it's a file, directory and destination.
​
Thanks,
https://redd.it/f9854m
@r_linux
reddit
LFTP (or other) to copy file / directory with same command
Hello, I think that I am not using lftp correctly. Does it possible with lftp to use the same command to copy file or directory ? Actually I am...
Linux Kernel Stack Smashing
https://blog.infosectcbr.com.au/2020/02/linux-kernel-stack-smashing.html
https://redd.it/f98ip8
@r_linux
https://blog.infosectcbr.com.au/2020/02/linux-kernel-stack-smashing.html
https://redd.it/f98ip8
@r_linux
blog.infosectcbr.com.au
Linux Kernel Stack Smashing
Dr Silvio Cesare @silviocesare Summary In this blog post I’ll discuss how to exploit the Linux kernel via a stack smashing...
The Facts: Mozilla’s DNS over HTTPs (DoH)
https://blog.mozilla.org/netpolicy/2020/02/25/the-facts-mozillas-dns-over-https-doh/
https://redd.it/f99kgx
@r_linux
https://blog.mozilla.org/netpolicy/2020/02/25/the-facts-mozillas-dns-over-https-doh/
https://redd.it/f99kgx
@r_linux
Open Policy & Advocacy
The Facts: Mozilla’s DNS over HTTPs (DoH)
The current insecure DNS system leaves billions of people around the world vulnerable because the data about where they go on the internet is unencrypted. We’ve set out to change ...
How a broken memory module hid in plain sight - and how I blamed the Linux Kernel and two innocent hard drives
https://chollinger.com/blog/2020/02/how-a-broken-memory-module-hid-in-plain-sight-and-how-i-blamed-the-linux-kernel-and-two-innocent-hard-drives/
https://redd.it/f9aah5
@r_linux
https://chollinger.com/blog/2020/02/how-a-broken-memory-module-hid-in-plain-sight-and-how-i-blamed-the-linux-kernel-and-two-innocent-hard-drives/
https://redd.it/f9aah5
@r_linux
Christian Hollinger
How a broken memory module hid in plain sight - and how I blamed the Linux Kernel and two innocent hard drives - Christian Hollinger
This is the story on how a broken stick of DDR-4 memory was hiding in plain sight for almost a year and me blaming hard drives and the Linux Kernel.
Kudos to LTT for the Linux videos they have been producing lately!
https://youtu.be/mAFMJ1LnQu8?t=1
https://redd.it/f9azdd
@r_linux
https://youtu.be/mAFMJ1LnQu8?t=1
https://redd.it/f9azdd
@r_linux
YouTube
10 ways Linux is just better!
Play World of Warships for FREE at https://wo.ws/37qYLRQ New players can use code BATTLESTATIONS2020 to receive 1 Million Credits, the USS Charleston, 3 days...
Make free encrypted backups to the cloud on Fedora
https://fedoramagazine.org/make-free-encrypted-backups-to-the-cloud-on-fedora/
https://redd.it/f9b3va
@r_linux
https://fedoramagazine.org/make-free-encrypted-backups-to-the-cloud-on-fedora/
https://redd.it/f9b3va
@r_linux
Fedora Magazine
Make free encrypted backups to the cloud on Fedora - Fedora Magazine
Learn how to get 25GB of free cloud storage you can use for encrypted backups from your Fedora system, using restic and the IBM Cloud.
Manjaro 19.0 released Gnome, KDE, XFCE, Architect
https://i.imgur.com/j8lUsfa.jpg
The Xfce edition remains our flagship offering and has received the attention it deserves. Only a few can claim to offer such a polished, integrated and leading-edge Xfce experience. With this release we ship Xfce 4.14 and have mostly focused on polishing the user experience with the desktop and window manager. Also we have switched to a new theme called Matcha. A new feature Display-Profiles allows you to store one or more profiles for your preferred display configuration. We also have implemented auto-application of profiles when new displays are connected.
Our KDE edition provides the powerful, mature and feature-rich Plasma 5.17 desktop environment with a unique look-and-feel, which we completely re-designed for this release. The full set of Breath2-themes includes light and dark versions, animated splash-screen, Konsole profiles, Yakuake skins and many more little details. We have rounded off text editor Kate with some additional color schemes and offer Plasma-Simplemenu as an alternative to the traditional Kickoff-Launcher. With a wide selection of latest KDE-Apps 19.12.2 and other applications Manjaro-KDE aims to be a versatile and elegant environment ready for all your everyday needs.
In Gnome edition which is based on version 3.34 series, we also have included a visual refresh for several applications and the desktop itself. The background selection settings also received a redesign, making it easier to select custom backgrounds. By default we added our own dynamic wallpaper that changes throughout the day. GNOME 3.34 also introduces custom folders in the application overview: Simply drag an application icon on top of another to create a folder. Folders are automatically removed again when all icons have been dragged out. With a simpler desktop layout we gain more stability. Our new Gnome-Layout-Switcher enables you to change your desktop layout easily with preset layouts mimicking popular operating systems. Available layouts are: Manjaro, Vanilla Gnome, Mate/Gnome2, Traditional Desktop/Windows, Modern Desktop/MacOs, Unity/Ubuntu Theme. We also automatically change between dark and light theme when Nightlight is triggered. A new theme for the login screen and the addition of Feral's Gamemode round up our Gnome edition.
Kernel 5.4 LTS is used for this release, such as the latest drivers available to date. Relative to the last installation media release, our tools have been improved and polished.
Pamac 9.3 series received a few updates. With a more robust and reliable transaction backend our update process should be much smoother now. Also we improved package sorting by relevance in our GTK-UI. Enhancing our package management we have enabled snap and flatpak support by default. You can now install snaps or flatpaks very easily, with our new tool Bauh and make use of a larger selection of the latest Linux applications.
https://forum.manjaro.org/t/manjaro-19-0-released-gnome-kde-xfce-architect/126010
https://redd.it/f9cou5
@r_linux
https://i.imgur.com/j8lUsfa.jpg
The Xfce edition remains our flagship offering and has received the attention it deserves. Only a few can claim to offer such a polished, integrated and leading-edge Xfce experience. With this release we ship Xfce 4.14 and have mostly focused on polishing the user experience with the desktop and window manager. Also we have switched to a new theme called Matcha. A new feature Display-Profiles allows you to store one or more profiles for your preferred display configuration. We also have implemented auto-application of profiles when new displays are connected.
Our KDE edition provides the powerful, mature and feature-rich Plasma 5.17 desktop environment with a unique look-and-feel, which we completely re-designed for this release. The full set of Breath2-themes includes light and dark versions, animated splash-screen, Konsole profiles, Yakuake skins and many more little details. We have rounded off text editor Kate with some additional color schemes and offer Plasma-Simplemenu as an alternative to the traditional Kickoff-Launcher. With a wide selection of latest KDE-Apps 19.12.2 and other applications Manjaro-KDE aims to be a versatile and elegant environment ready for all your everyday needs.
In Gnome edition which is based on version 3.34 series, we also have included a visual refresh for several applications and the desktop itself. The background selection settings also received a redesign, making it easier to select custom backgrounds. By default we added our own dynamic wallpaper that changes throughout the day. GNOME 3.34 also introduces custom folders in the application overview: Simply drag an application icon on top of another to create a folder. Folders are automatically removed again when all icons have been dragged out. With a simpler desktop layout we gain more stability. Our new Gnome-Layout-Switcher enables you to change your desktop layout easily with preset layouts mimicking popular operating systems. Available layouts are: Manjaro, Vanilla Gnome, Mate/Gnome2, Traditional Desktop/Windows, Modern Desktop/MacOs, Unity/Ubuntu Theme. We also automatically change between dark and light theme when Nightlight is triggered. A new theme for the login screen and the addition of Feral's Gamemode round up our Gnome edition.
Kernel 5.4 LTS is used for this release, such as the latest drivers available to date. Relative to the last installation media release, our tools have been improved and polished.
Pamac 9.3 series received a few updates. With a more robust and reliable transaction backend our update process should be much smoother now. Also we improved package sorting by relevance in our GTK-UI. Enhancing our package management we have enabled snap and flatpak support by default. You can now install snaps or flatpaks very easily, with our new tool Bauh and make use of a larger selection of the latest Linux applications.
https://forum.manjaro.org/t/manjaro-19-0-released-gnome-kde-xfce-architect/126010
https://redd.it/f9cou5
@r_linux
Are you a professional that uses Linux for work? If so what is it that you do ?
https://redd.it/f9brso
@r_linux
https://redd.it/f9brso
@r_linux
reddit
Are you a professional that uses Linux for work? If so what is it...
Posted in r/linux by u/MrDorkman • 5 points and 25 comments
pam_unix internals: unix_chkpwd
Have you ever bothered reading [Linux-PAM](http://www.linux-pam.org/) documentation?
Some years ago, I did.
Let's start with a super-quick intro:
PAM stands for Pluggable Authentication Modules. Linux-PAM provides authentication support in GNU/Linux.
One of the most interesting parts of Linux-PAM is the [pam\_unix module](http://www.linux-pam.org/Linux-PAM-html/sag-pam_unix.html).
More specifically, my favorite part of *pam\_unix* is the [unix\_chkpwd](https://github.com/linux-pam/linux-pam/blob/master/modules/pam_unix/unix_chkpwd.c) helper binary.
*unix\_chkpwd* does a very basic -nonetheless important- job: it verifies the password of the **current** user.
This makes it possible for applications like [xlock](https://linux.die.net/man/1/xlock) to work without being setuid-root (of course, a program running as unprivileged user cannot read */etc/shadow* !).
After reading about *unix\_chkpwd*, I was eager to give it a try...
...and so, I wrote a tiny bash noscript that leverages *unix\_chkpwd* to perform brute force attacks on current user password:
[https://github.com/marcobellaccini/chkpwd\_buddy](https://github.com/marcobellaccini/chkpwd_buddy)
Of course it is somewhat weird, but the cool part is that it does not require read access to */etc/shadow*!
I hope you enjoyed this post!
https://redd.it/f9e02s
@r_linux
Have you ever bothered reading [Linux-PAM](http://www.linux-pam.org/) documentation?
Some years ago, I did.
Let's start with a super-quick intro:
PAM stands for Pluggable Authentication Modules. Linux-PAM provides authentication support in GNU/Linux.
One of the most interesting parts of Linux-PAM is the [pam\_unix module](http://www.linux-pam.org/Linux-PAM-html/sag-pam_unix.html).
More specifically, my favorite part of *pam\_unix* is the [unix\_chkpwd](https://github.com/linux-pam/linux-pam/blob/master/modules/pam_unix/unix_chkpwd.c) helper binary.
*unix\_chkpwd* does a very basic -nonetheless important- job: it verifies the password of the **current** user.
This makes it possible for applications like [xlock](https://linux.die.net/man/1/xlock) to work without being setuid-root (of course, a program running as unprivileged user cannot read */etc/shadow* !).
After reading about *unix\_chkpwd*, I was eager to give it a try...
...and so, I wrote a tiny bash noscript that leverages *unix\_chkpwd* to perform brute force attacks on current user password:
[https://github.com/marcobellaccini/chkpwd\_buddy](https://github.com/marcobellaccini/chkpwd_buddy)
Of course it is somewhat weird, but the cool part is that it does not require read access to */etc/shadow*!
I hope you enjoyed this post!
https://redd.it/f9e02s
@r_linux
KDE Plasma 5.18.2 LTS Released!
https://kde.org/announcements/plasma-5.18.1-5.18.2-changelog.php
https://redd.it/f9fyqq
@r_linux
https://kde.org/announcements/plasma-5.18.1-5.18.2-changelog.php
https://redd.it/f9fyqq
@r_linux
kde.org
Plasma 5.18.2 Complete Changelog
Bluedevil Set all labels to plain text. Commit. See bug #417980. Phabricator Code review D27543 Add explicit includes to fix build with Qt 5.
Arch-Based Manjaro 19.0 Released With Flagship Edition Using Xfce 4.14
https://forum.manjaro.org/t/manjaro-19-0-released-gnome-kde-xfce-architect/126010
https://redd.it/f9g7zd
@r_linux
https://forum.manjaro.org/t/manjaro-19-0-released-gnome-kde-xfce-architect/126010
https://redd.it/f9g7zd
@r_linux
Manjaro Linux Forum
Manjaro 19.0 released (Gnome, KDE, XFCE, Architect)
Manjaro 19.0 We are happy to publish another stable release of Manjaro Linux, named Kyria. The Xfce edition remains our flagship offering and has received the attention it deserves. Only a few can claim to offer such a polished, integrated and leading-edge…