CPU temperature on Linux has two correct answers and each one fails on the wrong machine. Install lm-sensors and run sensors, or read a file under /sys/class/thermal. A temperature appears only after a kernel driver recognises a sensor chip and publishes its registers as files. The first command is therefore a detection command, and the
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useradd prints nothing and exits 0. That silence is not success, because the account it leaves behind has no home directory, a /bin/sh login shell, and a password field locked in /etc/shadow. I ran each flag on a fresh Ubuntu 24.04 account and read the state back after every one. The flags that carry the
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An AppImage arrives as a single file, and it runs without touching your package manager. Marking it executable and starting it takes three commands. Everything a normal install does for you stays your job, which is why a fresh AppImage so often needs a missing system library, a mount helper, or a menu entry added
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Ping comes back clean and the service still refuses you, so the question moves from the host to the path between you and it. The traceroute command answers that question by making every router on the way report back. Each probe it sends leaves with a small time to live value, and the first router
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To open a bin file in Linux, start with the bytes rather than the extension. I ask the file command to name the shape, because the same three letters cover a self-extracting installer, a disk image, a compiled program, and a heap of raw data. Each shape has its own two-command lane below, and I
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Steam installs in one command on the distributions that package it, and the instructions that fail name a package their release dropped. Valve’s published apt line for 32-bit OpenGL support still asks for libgl1-mesa-glx, a name Ubuntu kept only as an empty leftover in 22.04. What you install first is a launcher rather than the
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Bash keeps your history in two places, and the list that the history command prints is not the file the next shell reads. I ran history -c on a test session and printed the file straight afterwards, and every line was still in it. Clearing bash history means handling both stores, and the file is
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Running a Linux command from Python takes one call, and the one you pick decides whether the output lands in a variable. os.system is the short version, and the number it returns is not the exit code you expect. subprocess.run runs the same command and hands back the text, the error text, and the plain
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Disk partitioning tools on Linux all edit the same structure, a table that records which sectors belong to which partition. The trouble usually sits one layer below, where a partition entry and the filesystem inside it hold separate sizes. What those tools will do for you comes down to two rules. Unallocated space has to
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cat prints a file to your screen and stops there. The name is short for concatenate, because joining files is the job it was written for and reading a long one was never part of the plan. The cat command in Linux hands every byte of a file to standard output, so a long log
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