df -h /var can show the filesystem mounted at /, not a size for /var itself. I’m intrigued by how a path can lead to a mount’s space report instead of a directory total. You’ll get a clear sense of what each capacity column measures. Turn to df’s report and read its capacity figures alongside
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Knowing a program’s job but not its Ubuntu package name is enough to try apt search with a word describing that job. I can’t resist how a small search word can reach beyond package names into their descriptions. To make sense of a broad match, focus on the information APT searches. You can explore the
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the current time the total uptime the number of active users and the average system loads for the past 1, 5 and 15 minutes. A one-minute load average higher than the longer-window averages means demand has risen recently. I can’t resist digging into how much that compact signal reveals about system activity without naming a
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The load averages at the top of `top` can look alarming beside a CPU line showing plenty of idle time. I love the puzzle of numbers that seem to disagree until you know what each one measures. The task rows give you a process-level view instead of another machine-wide reading. You’ll see how `top` sets
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Here, `whoami` and `id -un` show the same account name. I love how that small equivalence makes the scope of `whoami` clear without turning it into a full account profile. Compare the question you have with the value each command reports. That distinction helps you choose between `uname` and `whoami`. What uname and whoami tell
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The command `wget -nv -O wget-robots.txt https://www.linuxfordevices.com/robots.txt` saves a 67-byte response under `wget-robots.txt`. I enjoy following the handoff from a web address to a named file on disk. The URL and output name give you two useful points to follow through the command. Trace the request from that URL into Wget’s work. What wget does
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`fatal error: stdio.h: No such file or directory` is a frustrating result when `gcc` itself answers in the terminal. I couldn’t resist finding out how an installed compiler can still be short of what a simple C program needs. The payoff is a C program that compiles and runs instead of stopping at the include
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Why does the DNS reply list the resolver as Source when the query listed it as Destination? I couldn’t resist digging into how those fields mark the answer’s return trip. Wireshark turns that question into something you can inspect on Ubuntu or Debian. Get it running and start a capture while a DNS lookup takes
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You have `~/.bashrc` open beside `~/.profile`, and neither filename tells you which one shaped the terminal you just started. I couldn’t resist digging into how Bash chooses between them, because the answer depends on the kind of shell it opened. Getting that choice right helps explain why an alias appears in one terminal but a
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With `sleep 30` running in the foreground, Ctrl+C can cut the wait short. I’m fascinated that a keypress can interrupt a running command without changing the rest of the computer’s power state. That matters when choosing between a timer and waiting for a child process to end. The command’s scope starts with the process `sleep`
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