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awk Command in Linux: Syntax, Patterns, and Examples
Use awk to extract columns, filter records, and build reports from the command line, with practical examples of patterns, built-in variables, functions, and arrays.
Linux basename Command: Get File Name from Path in Bash
Get just the file name from a full path in Bash. This guide covers basename options, suffix stripping, and how it compares to parameter expansion.
echo Command in Linux: Print Text and Variables
Print text, variables, script arguments, and exit codes with echo in Linux, plus escape sequences, colored output, and the quoting pitfalls to avoid.
Grep Command in Linux with Examples
The grep command searches files for text patterns. Quick examples for case-insensitive, recursive, whole-word, regex, and context-line searches.
Grep Multiple Patterns: Match Strings, Words, and Regex
Search for multiple patterns or strings at once with grep using the -e flag, fixed-string matching, alternation, and pattern files.
Block Devices, Partitions, and Filesystems in Linux Explained
Linux storage works in layers: block device, partition, filesystem, mount point. This guide explains what each layer does and which command inspects it.
Grep Exclude: Patterns, Files, and Directories
Use grep to exclude patterns, files, and directories from search results. Examples for --invert-match, --exclude, --exclude-dir, and --include.
Bash Shebang: What #!/bin/bash Means in Shell Scripts
A Bash shebang tells Linux which interpreter runs a script. See what #!/bin/bash means, how /usr/bin/env bash differs, and what happens without #!.
last Command in Linux: Check Login History
Use the last command in Linux to check login history, filter sessions by user or date, and audit access. Covers lastb, lastlog, and the wtmpdb replacement.
How to Use wget in Linux with Examples
Practical wget examples for downloading files, resuming transfers, limiting bandwidth, mirroring websites, and handling authentication on Linux.
Series
Cheatsheets
awk Cheatsheet
Quick reference for the awk text processing command
grep Cheatsheet
Quick reference for the grep text search command
wget Cheatsheet
Quick reference for downloading files and mirroring websites with wget
nmap Cheatsheet
Quick reference for host discovery, port scanning, and service detection with nmap in Linux