uptime command in Linux

This uptime command guide is a follow-up to my previous 90 Linux Commands frequently used by Linux Sysadmins article. As time allows, I will continue to publish articles on these 90 commands geared toward Linux sysadmins and power users. Let’s continue this series with the uptime command. The uptime outputs the current time, system uptime, number of logged-in […]

btop – the htop alternative

Meet btop, an aesthetically pleasing system resource monitor showing usage and stats for processor, memory, disks, network, and processes. btop is the lighter and faster C++ version and continuation of bashtop and bpytop. Over the years, the available options for command-line system monitoring tools have grown quite a bit. There is top, htop, glances, nmon, ytop, gtop, vtop, and […]

How to Kill Inactive SSH Sessions

So, you’ve been disconnected from your server a couple of times, resulting in inactive ssh sessions. You know this because when you use the “w” command, you see something like the following… 22:47:28 up 315 days, 21:09, 2 users, load average: 9.04, 8.17, 7.30 USER TTY FROM LOGIN@ IDLE JCPU PCPU WHAT root pts/0 ipxxx-xxx-xxx-xxx 23:54 26:40 […]

Free vs. Available Memory in Linux

At times we will need to know precisely how our Linux systems use memory. This article will examine how to use the free command-line utility to view memory usage on a Linux system. In doing so, we will clearly define the difference between free vs. available memory on Linux systems.   Free vs. Available memory […]

grep command in Linux w/ examples

This grep command guide is a follow-up of my previous 90 Linux Commands frequently used by Linux Sysadmins article. Every week, or as time allows, I will publish articles on around 90 commands geared toward Linux sysadmins and Linux power users. Let’s continue this series with the grep command. Grep (global regular expression printer) searches through a file for a specific […]

last command in Linux with Examples – View history of user logins

This last command guide is a follow-up of my previous 90 Linux Commands frequently used by Linux Sysadmins article. Every week, or as time allows, I will publish articles on around 90 commands geared toward Linux sysadmins and Linux power users. Let’s continue this series with the last command. You may be working with other system administrators and developers […]

Using the find command in Linux with examples

This find command guide is a follow-up of my previous 90 Linux Commands frequently used by Linux Sysadmins article. Every week, or as time allows, I will publish articles on the ~ 90 commands geared toward Linux sysadmins and Linux power users. Let’s continue this series with the find command. The find command is part of findutils which […]

ip command from iproute2 – utilities for TCP/IP networking in Linux

This ip command guide is a follow-up of my previous 90 Linux Commands frequently used by Linux Sysadmins article. Every week, or as time allows, I will publish articles on the ~ 90 commands geared toward Linux sysadmins and Linux power users. Let’s continue this series with the IP command. For Linux sysadmins, it is crucial […]

df command in Linux with examples

This article is a follow up to the previous 90 Linux Commands frequently used by Linux Sysadmins post. Every week, as time allows, I will publish articles on the ~ 90 commands geared toward Linux sysadmins and Linux power users. Use the df command when you need to know how much space is available on […]