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How to Unzip a .gz File in Linux
Unzip a .gz file in Linux with gzip or gunzip, keep the original file when needed, and extract .tar.gz archives with tar.
Docker CMD vs ENTRYPOINT: Differences Explained
Compare Docker CMD and ENTRYPOINT with working Dockerfile examples, runtime overrides, shell vs exec form, signal handling, and Docker Compose.
id Command in Linux: Display User and Group Information
Use the id command to print a user's UID, GID, and group memberships, get single values for shell scripts, and see why a newly added group does not show up yet.
How to Use the pkill Command in Linux
The pkill command sends signals to Linux processes by name, user, terminal, or full command pattern. Covers safe matching, common options, and examples.
How to Set or Change Timezone on Ubuntu Server and Desktop
Check the current time zone on Ubuntu and change it permanently with timedatectl, or switch it from the Date & Time panel on Ubuntu Desktop.
pgrep Command in Linux: Find and Filter Running Processes
The pgrep command finds running processes by regex pattern, user, terminal, or parent PID and prints matching PIDs. This guide covers exact matching, filtering options, and script-friendly exit checks.
The ~/.ssh Folder: Files, Permissions, and Layout
What lives inside ~/.ssh on Linux: private keys, authorized_keys, known_hosts, config, and the recommended permissions for each file.
How to Comment Out Multiple Lines in Vim
Comment out multiple lines in Vim with visual block mode, line ranges, or bundled gc mappings, then remove comments with the matching commands.
Nginx 413 Request Entity Too Large: client_max_body_size Fix
Fix the Nginx 413 Request Entity Too Large error: raise client_max_body_size in the right context and match the PHP-FPM upload limits.
ssh Command in Linux: Connect to Remote Servers
The ssh command connects you to a remote Linux server. This guide covers its syntax, the most useful options, key-based login, and port forwarding.
Series
Cheatsheets
HTTP Status Codes Cheatsheet
HTTP status codes from 1xx to 5xx, common error causes, Nginx and Cloudflare codes, and curl and log commands for checking responses.
jq Cheatsheet
jq filter reference for selecting fields, filtering arrays with select, building objects, CSV and TSV output, shell variables, and editing JSON files.
CIDR and Subnet Mask Cheatsheet
IPv4 CIDR prefix to subnet mask table from /0 to /32 with address and host counts, subnet boundaries, reserved ranges, IPv6 prefix sizes, and CIDR in Linux commands.
tr Cheatsheet
tr command reference for translating, deleting, and squeezing characters, with character classes, escape sequences, case conversion, and pipeline recipes.