You can use the following command to find information about the CPU on a Red Hat Linux (RHEL) system: lscpu This command provides a detailed report of the CPU architecture, including the number of processors, cores, and threads, clock speed, cache size, and other information. You can also use the /proc/cpuinfo file to get information … Read more
Adding swap on a FreeBSD Unix system is a straightforward process that can be done using the following steps: Create a swap file: sudo dd if=/dev/zero of=/swapfile bs=1M count=1024 This creates a file called “/swapfile” with a size of 1024 MB. You can adjust the size of the file as needed by changing the value … Read more
To patch and protect a Linux server against the Glibc GHOST vulnerability (CVE-2015-0235), you need to upgrade the glibc package to a version later than 2.18. The exact steps for upgrading glibc may vary depending on your Linux distribution and the package management system used. Here are the steps for some of the most common … Read more
The GHOST vulnerability is a critical vulnerability that affects the GNU C Library (glibc) versions prior to 2.18. To test if a Linux server is secure and not vulnerable to GHOST, you can use the following command: env ‘x=() { :;}; echo vulnerable’ ‘BASH_FUNC_x()=() { :;}; echo vulnerable’ bash -c ‘echo hello’ If the output … Read more
You can check the version of KVM (qemu-kvm) installed on a Linux system by using the following command: kvm –version or qemu-kvm –version This will print the version number of the installed KVM (qemu-kvm) package. The output should look something like this: QEMU emulator version 4.2.0 (Debian 1:4.2-2ubuntu2) Copyright (c) 2003-2021 Fabrice Bellard and the … Read more
You can perform a stress test on your CPU and memory (in a virtual machine) on a Linux/Unix system using the stress-ng tool. stress-ng is a stress testing tool that can be used to test various aspects of a Linux/Unix system, including the CPU and memory. To stress test the CPU, you can use the … Read more
On Linux, you can check BIOS settings from the command line by using the dmidecode utility. dmidecode is a tool that retrieves information from the system’s BIOS and reports it in a human-readable format. To check the BIOS settings, you can use the following command: sudo dmidecode -t 0 This will display a summary of … Read more
To force a DHCP client (dhclient) on FreeBSD to renew its IP address and get a new lease, you can use the following command: dhclient -r dhclient The first command, dhclient -r, releases the current DHCP lease, and the second command, dhclient, obtains a new lease from the DHCP server. After running these commands, the … Read more
To install the X Window System XQuartz on macOS for ssh X11 forwarding, follow these steps: Download the XQuartz installer from the official website: https://www.xquartz.org/ Install XQuartz by double-clicking on the downloaded installer package and following the instructions. Once XQuartz is installed, log out and log back in to your macOS account to activate X11 … Read more
In Bash on Linux, macOS, and Unix, you can reissue and repeat a long command without retyping it by using the following methods: Using the up arrow key: Press the up arrow key to recall the previous command. You can scroll through previous commands using the up and down arrow keys. Once you have found … Read more