All About Linux.

A command can finish without showing how long it took. The Linux time command reports a command’s elapsed duration and CPU time. I’ll show how to time a command and choose the right time implementation for its summary. TL;DR: Time a Linux Command Prefix a command with time to measure it, and use /usr/bin/time when

A Linux machine may need to reach a service on another host, and a port check can show whether a TCP connection gets through. The telnet command attempts that connection and lets you interact with the endpoint. I’ll explain how to run the check and how to interpret its response. TL;DR The telnet command opens

Choosing a Linux desktop means deciding how its menus, panels and controls should fit the way you work. A desktop environment provides those on-screen parts, including menus, panels and settings tools. This piece helps you choose a desktop that fits your workflow and check whether your distribution supports it. TL;DR: Which Linux desktop should you

A Linux machine can show little free RAM when you are checking whether another application has room to run. Linux memory management assigns physical pages to processes and cached file data as demand changes. This article shows how to compare MemFree with MemAvailable and use vmstat to check for active paging. TL;DR: Read Available Memory

A service that will not accept a connection can leave you checking which ports Linux is listening on. netstat shows network connections and listening ports, while nslookup queries DNS records for a hostname. This article shows how to inspect listening ports with netstat and ss, then check a hostname’s DNS answer with nslookup. TL;DR Use

A Linux account may need access to a shared directory or device that is controlled by a group. The usermod command adds an existing account to a supplementary group, an additional membership that does not change its primary group. I’ll show how to add an account to one or more groups and check its membership

A machine set to UTC may show a different local time than you expect. Its timezone applies regional rules to the system clock to produce local date and time. This article explains how to find a zone name and change the Linux timezone with timedatectl. TL;DR: Change the Linux timezone Use timedatectl to choose an

A short status message is often all a shell script needs to show while it runs. The Bash echo command writes its arguments to standard output and normally adds a newline. I’ll show how to print text and variables, then explain when echo behaves differently across shells. TL;DR: Echo command in Linux The Bash echo

Moving between folders in a terminal starts with knowing which directory the shell is working in. The cd command changes the shell’s current directory to a path or a destination such as your home directory. This article explains how to choose a path to a directory and use cd’s shortcuts to move from there. TL;DR