In Unix/Linux, you can use the “kill” command to terminate a running process or job. To kill all your jobs under the current shell session, you can use the following steps: Open a terminal and list all your running jobs by typing: jobs This will display a list of all the jobs that are currently … Read more

In Linux, the “faillog” command is used to display and manage records of login failures. The faillog command reads and displays information from the file /var/log/faillog, which stores the information about failed login attempts. Here’s how to use the faillog command to display records of login failure: Open a terminal and log in as root … Read more

In Bash shell, you can append the current date to a filename using the “date” command and command substitution. Here’s how to do it: Use the “date” command to generate the current date in a specific format. For example, to generate the current date in the “YYYY-MM-DD” format: date +%Y-%m-%d This will output the current … Read more

In Bash shell, you can generate random numbers using the built-in “RANDOM” variable or the “shuf” command. Here’s how to do it: Using the RANDOM variable: Use the “$RANDOM” variable to generate a random number between 0 and 32767: echo $RANDOM This will output a random number each time you run the command. Use the … Read more

In Linux or UNIX, you can run multiple X sessions (graphical sessions) simultaneously by using different virtual terminals (VTs). Here’s how to do it: Press “Ctrl + Alt + F2” (or any other function key from F2 to F7) to switch to the second virtual terminal. This opens a new login prompt. Log in with … Read more

To display only today’s files in Linux or UNIX, you can use the “find” command with the “-daystart” and “-ctime” options. Here’s how to do it: find /path/to/files -daystart -ctime 0 This command searches for files in the specified directory (/path/to/files in the example) that were created or modified within the last 24 hours. The … Read more

Memory leaks can be a common problem for long-running programs, and they can cause performance issues and system crashes over time. Fortunately, Linux provides tools to check for memory leaks in programs. Here are some steps to do so: Install the valgrind tool: Valgrind is a popular tool for detecting memory leaks and other memory-related … Read more

OpenBSD includes support for mounting NTFS file systems, but you need to install the ntfs-3g package to mount them. Here’s how to mount an NTFS file system on OpenBSD: Install the ntfs-3g package: The ntfs-3g package provides the tools necessary to mount NTFS file systems on OpenBSD. You can install it using the package manager … Read more

If you’re seeing a “Too many open files” error on Nginx, it means that the operating system’s limit on the number of open files has been reached. This can happen when Nginx is running a high-traffic website, serving a large number of requests, and opening a large number of files. Here are some possible solutions … Read more

A manpage is a documentation file that provides detailed information about a specific command, program or function on a Linux/UNIX system. Here are the steps to create a manpage: Choose a name for your manpage: Typically, the name of the manpage should be the same as the name of the command or program you want … Read more