Managing a Debian or Ubuntu server from a browser calls for an administration tool that runs on the server. Webmin provides that interface, which you access through a browser. I’ll show how to install Webmin from its APT repository and connect to its HTTPS interface. TL;DR Use Webmin’s setup script to configure its APT repository
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Linux password rules can be stored in different places, depending on whether they check a new password or control when an account password expires. A Linux password policy combines password-quality checks with account settings that determine when passwords expire. I’ll show how to inspect the active PAM password stack and read an account’s aging settings
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Running a Java program requires a runtime, while building one also requires a compiler. Debian provides OpenJDK packages through APT, including a runtime and a development kit. This article shows how to check which Java packages your Debian repositories offer and choose the JDK or runtime package to install. TL;DR Install Debian’s default Java development
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At the prompt, a script may receive a value typed by the user or capture output from a command. A shell variable gives that value a name the script can use later. In this piece, I’ll show how to assign and use Bash variables, including passing a value to a child process. TL;DR In Bash,
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Working with text records at the shell can mean finding the rows and fields that matter. awk reads text records and lets you select fields or calculate totals. I’ll show how to select fields and summarize matching records, then save the program in an awk file for reuse. TL;DR: Use awk to select and reshape
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To see which login sessions a Linux system has recorded, use the who command. It reads login records, usually from utmp, and lists the sessions they contain. I’ll explain its output fields and show how to select the session associated with standard input. TL;DR The who command lists login sessions recorded on a Linux system,
Who Command in Linux: Check Logged-In Users Read More »
When a file or directory needs different access, the task is to change its permissions without opening it up more than intended. chmod changes the rules that control access to files and directories. I’ll show how to set permissions with a number such as 640 or a letter-based change such as u+x, then check the
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Terminal output can be useful to review alongside the commands that produced it. The Linux script command records an interactive terminal session in a file called a typescript, which contains entered commands and visible results. I’ll show you how to record and replay a session, and how to check its log for private input. TL;DR:
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To schedule a Linux command for one future run, use at. The at utility queues a shell command as a job for the atd scheduler service to run once at a later time. I’ll explain what at does and show how to schedule a one-time job. TL;DR: Schedule a one-time Linux command The at command
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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
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