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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.
How to List Users in Linux
List all users in Linux with getent passwd, lslogins, or /etc/passwd. Filter human users by UID, check group membership, and see who is logged in.
history Command in Linux: View and Manage Bash History
Use the history command in Linux to view, search, and clean up Bash command history. Covers expansions, HISTSIZE, HISTIGNORE, and security tips.
lsblk Command in Linux: List Block Devices
Use lsblk to list disks, partitions, filesystems, UUIDs, and mount points in Linux, then customize columns and produce JSON output for scripts.
Series
Cheatsheets
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
SFTP Cheatsheet
Quick reference for the Linux sftp client, covering login, navigation, transfers, and remote file management over SSH