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bc Command in Linux: Command-Line Calculator
Use bc for arbitrary-precision math on the Linux command line, with examples covering scale, functions, base conversion, and use inside shell scripts.
type Command in Linux: Show Command Type and Location
Check how Bash resolves a name with type: alias, function, builtin, keyword, or file on disk. Covers -t, -a, -p, -P, and where Zsh and dash differ.
pushd and popd Commands in Linux: Navigate Directories with a Stack
Save directories to a stack with pushd, return with popd, and jump between them in Bash. Covers dirs, stack rotation, ~N shortcuts, quiet use in scripts, and common errors.
wall Command in Linux: Broadcast Messages to Logged-In Users
The wall command broadcasts a message to the terminals of all logged-in users in Linux. This guide covers sending messages from arguments, files, and pipes, with group targeting and banner control.
cat Command in Linux: View, Combine, and Create Files
Display, combine, and create files with the cat command in Linux, plus line numbers, hidden characters, and when to use less instead.
shutdown Command in Linux: Power Off, Reboot, and Schedule
How to use the shutdown command in Linux to power off, halt, or reboot the system immediately or at a scheduled time, with examples of all common options.
tee Command in Linux with Examples
Use the tee command to save command output to a file while still printing it in the terminal. Covers appending, writing to multiple files, capturing errors, and sudo tee for root-owned files.
How to Select All in Vim: Copy, Delete, or Yank Every Line
Select all text in Vim with ggVG, yank every line with :%y, copy the whole file to the system clipboard, or delete all lines with :%d. No plugins required.
How to Fix Broken Packages and Unmet Dependencies on Ubuntu
Fix broken packages and unmet dependencies on Ubuntu, repair interrupted installations, and diagnose held packages and repository conflicts.
/etc/passwd in Linux: File Format and Fields Explained
The cat /etc/passwd command displays local Linux accounts. This guide explains its seven fields and when to use getent passwd instead.
Series
Cheatsheets
tr Cheatsheet
tr command reference for translating, deleting, and squeezing characters, with character classes, escape sequences, case conversion, and pipeline recipes.
Bash Parameter Expansion Cheatsheet
Bash parameter expansion syntax for default values, substrings, prefix and suffix removal, search and replace, case conversion, and arrays.
Bash Keyboard Shortcuts Cheatsheet
Bash keyboard shortcuts for editing commands, searching history, completing words, and controlling foreground jobs.
Netcat Cheatsheet
Quick reference for using the Netcat nc command to test ports, listen for connections, transfer files, and send raw network requests