How To Save The Output Of Screen Windows To A File On Linux Linux powers the vast majority of the cloud, supercomputers, and embedded systems. Modern distributions have shifted toward immutable architectures (like Fedora Silverblue) and container-first workflows. The Modern Approach Systemd remains the init standard, but tools like systemctl and journalctl are now complemented…
How To Detect Whether A File Is Readable And Writable In Python Python continues to dominate in data science, AI, and backend development. With the release of Python 3.12+, performance improvements and better error messages have made it even more robust for production environments. The Modern Approach Modern Python development emphasizes type hinting and asyncio…
How to set up the driver for an HP all-in-one printer/scanner on Rocky Linux 9 Linux? First, install these packages and it may ask you to download and install other plugins. Without these packages, my printer does work. # yum install hplip hplip-gui hpijs Second, install plugins for the HP printer. # hp-plugin Then you…
How To Make Tee Catch The Stderr Only In Linux Linux powers the vast majority of the cloud, supercomputers, and embedded systems. Modern distributions have shifted toward immutable architectures (like Fedora Silverblue) and container-first workflows. The Modern Approach Systemd remains the init standard, but tools like systemctl and journalctl are now complemented by eBPF-based observability…
How To Handle Spaces In Paths With Rsync On Linux Linux powers the vast majority of the cloud, supercomputers, and embedded systems. Modern distributions have shifted toward immutable architectures (like Fedora Silverblue) and container-first workflows. The Modern Approach Systemd remains the init standard, but tools like systemctl and journalctl are now complemented by eBPF-based observability…
How To Make A Unique Temporary File In Bash On Linux Bash remains the default shell for most Linux distributions and macOS systems. While newer shells like Zsh and Fish offer enhanced interactivity, Bash’s ubiquity makes it essential for system administration and CI/CD pipelines. The Modern Approach In modern environments (Bash 5.2+), prefer [[ ]]…
How to Check if a Key Exists in a Python Dict Checking for key existence is a fundamental operation in Python to avoid KeyError. The Code if ‘key’ in my_dict: print(“Exists”) Python in 2026 In 2026, the in operator is still the most Pythonic and fastest way to check for keys. For more complex logic,…
How to Collect VM Exit Numbers in KVM VM exits occur when a virtual machine needs the hypervisor’s attention. Monitoring these can help debug performance issues. The Command cat /sys/kernel/debug/kvm/exits KVM in 2026 In 2026, KVM remains the standard for Linux virtualization. For more detailed tracing, administrators use perf or ftrace: perf record -e kvm:*…
How tinstall aria2 on Rocky Linux 9? aria2 is a great tool for downloading files from the Internet. The software package for aria2 is proved in EPEL. To install aria2, first, enable EPEL following instructions here. Then, install aria2 by # yum install aira2 Editor’s note: This article has been updated to reflect current software…
curtlftpfs is a nice tool to mount ftp to local. How to install curlftpfs on Rocky Linux 9? The software package for curlftpfs is proved in EPEL. To install curlftpfs, first, enable EPEL following instructions here. Then, install curlftpfs by # yum install curlftpfs Editor’s note: This article has been updated to reflect current software…
When we create VMs in KVM, we may don’t know the IP addresses because they are automatically assigned by DHCP. So we want to get them in VMM so that can login by SSH. Do the commands as follows. $ virsh domiflist hvm1 Interface Type Source Model MAC ——————————————————- vnet0 network default virtio 52:54:00:1c:36:cd $…
How To Use Vnc To Connect Remote Server With Gui Desktop Linux powers the vast majority of the cloud, supercomputers, and embedded systems. Modern distributions have shifted toward immutable architectures (like Fedora Silverblue) and container-first workflows. The Modern Approach Systemd remains the init standard, but tools like systemctl and journalctl are now complemented by eBPF-based…
sshfs is a nice tool. But it seems there is no support to it in a newly installed Rocky Linux 9 Linux system: Not installed by default: # sshfs -bash: sshfs: command not found Seems not available from the repositories # yum install sshfs -y Loaded plugins: fastestmirror Repodata is over 2 weeks old. Install…
How To Change Config_Hz Parameter For Linux Kernel Linux powers the vast majority of the cloud, supercomputers, and embedded systems. Modern distributions have shifted toward immutable architectures (like Fedora Silverblue) and container-first workflows. The Modern Approach Systemd remains the init standard, but tools like systemctl and journalctl are now complemented by eBPF-based observability tools for…
My Ubuntu boots to GUI mode by default. How to make Ubuntu Linux boot to text mode? If you are using Ubuntu older than 16 such as Ubuntu 24.04 LTS: Edit /etc/default/grub Change GRUB_CMDLINE_LINUX=… to GRUB_CMDLINE_LINUX=”text”. Backup your old grub config`$ sudo cp -n /etc/default/grub /etc/default/grub.bak-date +%s ` Update grub$ sudo update-grub If you are…
Flash Player on CentOS 7 (Legacy) Adobe Flash Player reached its End of Life (EOL) on December 31, 2020. The Modern Context In 2026, Flash is no longer supported by any modern browser or operating system. Adobe blocked Flash content from running in Flash Player after 2021. Alternatives in 2026 For legacy content that previously…
I find the rtl8192cu wireless adapter driver on Rocky Linux 9 is quite unstable. After running a while, the connection will disappear. How to make it stable? There is a bug in some hardware where the device never wakes back up. You may try disabling the power management by putting a file 8192cu-disable-power-management.conf under /etc/modprobe.d/:…
How to Install aclocal on Fedora aclocal is part of the GNU Autotools suite, used for generating aclocal.m4 files. The Command sudo dnf install automake Fedora in 2026 In 2026, Fedora 43+ is the current release. The automake package provides aclocal, automake, and related tools. For modern C/C++ development, many developers are moving toward CMake…
How to Add Multiple Static IPs to a Xen VM Configuring multiple IP addresses on a single interface is common for hosting. The Command sudo ip addr add 192.168.1.100/24 dev eth0 Virtualization in 2026 In 2026, while Xen is still used in some cloud environments, KVM has become the standard for Linux virtualization. For managing…
How to Install NAS Parallel Benchmarks The NAS Parallel Benchmarks (NPB) are a suite for evaluating the performance of high-end computers. The Steps Download: Get the source from the NASA website. Compile: make suite (requires MPI and Fortran compilers). HPC in 2026 In 2026, while NPB is still used for legacy comparisons, many HPC centers…