Linus Torvalds has released the first stable Linux kernel update of 2020, Linux 5.5 – and it’s on schedule despite the worries that downtime over the holidays would have an impact on its release. The Linux 5.5 kernel update (dubbed “Kleptomaniac Octopus”) brings a host of performance tweaks as well as support for devices like the Raspberry Pi 4 and Broadcom chip BCM2711.
Source: “Welcome, Kleptomaniac Octopus” – Linux 5.5 Lands, Here’s What’s New
You can use the logger tool. The simple command to log is
logger My syslog message from console.
Sometimes you may find lot of characters trncated due to 80×25 tty size by default. Especially when you want to open some log files. Below command will help to set the row and column size.
stty cols 132 rows 34
will set the column width to 132 and rows 34.
Screen command benefits
The command to create a screen session is
screen -t <screen name> -S <socket file name>
To detach a screen session
ctrl+a + d
To list the screen sessions
screen -ls
To reattach the screen session
screen -r <pid/name from the list>
Presume you lost the console where the screen was running before detaching the screen. You can detach and reattach using the below command
screen -dr <pid/name from the list>
The file /etc/SuSE-release contains the SuSE version and patch level.
This file is deprecated now and you can use /etc/os-release to find the details
Udev in linux subsystem helps to write scripts to do a specific action when a new device is added or an existing device is removed from the system.
The following article helps you to write your own basic script by identifying a device and adding the specific udev rules. Refer An introduction to Udev: The Linux subsystem for managing device events for more details.
The Linux® system call interface permits user-space applications to invoke functionality in the kernel, but what about invoking user-space applications from the kernel? Explore the usermode-helper API, and learn how to invoke user-space applications and manipulate their output. Read more…