Articles by Dejan Panovski
How to Flush DNS Cache on Linux, Windows, macOS, and Chrome
Commands to flush the DNS cache on Linux (systemd-resolved, dnsmasq, nscd), Windows, and macOS, plus how to clear the Chrome and Firefox DNS cache.
Bash Pattern Matching: =~ Operator and Regular Expressions
Match strings in Bash with globs, extglob, and the =~ regex operator. Use anchors, quoting, and BASH_REMATCH to test input and capture groups.
unlink Command in Linux: Remove a Single File
Remove one file or symlink with unlink. See how it differs from rm, how hard links affect deletion, and how to fix common errors.
How to Extract (Unzip) tar.gz Files in Linux
Extract (untar) tar.gz and tgz archives with the tar command. Covers extracting to a directory, pulling specific files, wildcards, stdin piping, and listing archive contents.
How to Convert Integer into String in Python
Convert an int to a str in Python with str(), f-strings, and format(), add leading zeros, build binary or hex strings, and join a list of numbers.
How to Convert Strings to Integers in Python
Convert strings to integers in Python with int(), handle invalid input, remove separators, and parse binary, octal, and hexadecimal values.
How to Resize and Extend a Linux Partition and Filesystem
Extend a Linux partition and grow ext4, XFS, Btrfs, or LVM storage after a disk resize, with layout checks, safe ext4 shrink steps, and troubleshooting.
Linux ip Command with Examples
How to use the Linux ip command to show and assign IP addresses, bring interfaces up or down, and manage routes, with ip a and ip -br output explained.
chown Command in Linux: Change File Ownership
Use the chown command in Linux to change file and directory ownership, including recursive changes, symbolic links, and practical ownership examples.
How to Create a Directory in Linux: mkdir Command Examples
Create single, multiple, and nested directories in Linux with mkdir, set permissions with -m, and fix 'Permission denied' and 'No such file or directory' errors.
sqlite3 Command Line: Create and Query SQLite Databases
Create and query SQLite databases with sqlite3 on Linux. Import CSV files, format query results, and back up or restore your data.
How to Check CPU Usage in Linux
This guide explains how to check CPU usage in Linux with top, htop, mpstat, vmstat, sar, ps, uptime, and per-core load tools.
modprobe Command in Linux: Load and Manage Kernel Modules
modprobe adds and removes Linux kernel modules along with their dependencies. See how to pass parameters, blacklist drivers, load modules at boot, and fix errors.
503 Service Unavailable Error: Causes and How to Fix It
The 503 Service Unavailable error means the server cannot handle your request right now. This guide explains what causes it on Nginx, Apache, and load balancers, and how to fix it.
Fix npm Error: unable to get local issuer certificate
Resolve the npm UNABLE_TO_GET_ISSUER_CERT_LOCALLY error by trusting the right CA certificate instead of disabling TLS verification.
How to Rename a Directory or Folder in Linux
Rename a folder in Linux with mv, avoid the move-inside-existing-directory trap with -T, and batch rename directories using loops, find, and rename.
git fetch vs git pull: What Is the Difference?
git fetch downloads remote changes without touching your branch, while git pull also merges or rebases them. See when to use each and how to fix pull errors.
nmap Command in Linux with Practical Examples
Practical nmap examples for Linux: find live hosts, scan specific or top ports, run sudo nmap SYN scans, detect service versions, and speed up scans with -T4.
Configuring the Apache Error and Access Logs
How to configure and read Apache access and error logs, including log formats, virtual host logging, log file locations, and filtering log output.
Linux patch Command: Apply Diff Files
The Linux patch command applies diff files to your original files. Examples cover creating a patch with diff, testing it with --dry-run, -p1 for Git patches, backups, and reversing changes.
