In Linux, groups organize user accounts and define shared access to files and resources. Every group member inherits the read,…
The touch command in Linux does two things: it creates new empty files, and it updates the timestamps on existing files and…
The rsync command in Linux synchronizes files and directories between two locations, locally or over SSH. Unlike scp, which copies files unconditionally, rsync…
The patch command in Linux applies a set of changes from a diff file to one or more original files. It is…
The basename command in Linux extracts the last component of a file path, removing the leading directory portion and an optional trailing…
The timeout command in Linux runs a command with a time limit and terminates it when the limit is reached. It is part of GNU coreutils, available on virtually every Linux distribution. It is most useful for commands with no built-in timeout option, such as ping, curl, tcpdump, or a custom script that might hang indefinitely. How the timeout Command Works in Linux The syntax is: bashtimeout [OPTIONS] DURATION COMMAND [ARG]... Duration is a number followed by an optional unit: s (seconds, default when omitted), m (minutes), h (hours), or d (days). Floating-point values are supported: bashtimeout 5 ping 8.8.8.8…
The rmmod command in Linux removes a loaded module from the running kernel. Because the kernel has a modular design, you can…
The free command in Linux gives you a quick summary of RAM and swap usage. It reads from /proc/meminfo and displays the data in…
The diff command in Linux compares two text files line by line and shows the lines that differ. When files are identical,…
DNS cache is a temporary database your OS and browser build as you browse. Each time you visit a website, the domain-to-IP mapping is saved locally, cutting out the round trip to a remote DNS server on repeat visits. Stale entries are the most common reason to flush the DNS cache: a server moves to a new IP, but your OS or browser still routes to the old address. This guide covers how to clear the DNS cache on Windows, Linux, and macOS, and how to flush the separate cache stored inside Chrome and Firefox. Flush DNS Cache on Windows The command is the same on Windows 10, Windows 11, and earlier supported releases. Open Command Prompt with administrator privileges. Type cmd in the Windows search bar, right-click Command Prompt, and select Run as administrator. Run the flush command: bashipconfig /flushdns A successful run prints:…