Tag: cli

By default bash history is lost across multiple terminal sessions. Fix it with HISTAPPEND and PROMPT_COMMAND so nothing gets overwritten.

Rename files to remove spaces and special characters using bash, rename, tr, and parameter expansion patterns for bulk file cleanup.

Repair and optimize all MySQL databases at once with mysqlcheck, a one-liner that runs on every table without logging into MySQL.

Set, verify, and sync your timezone in Ubuntu using timedatectl, one command to fix the clock on a newly provisioned server.

socat wires TCP, UDP, Unix sockets, files, and serial ports together. Port forwarding, OpenSSL tunnels, traffic capture, this is netcat with superpowers.

ss replaces netstat on modern Linux: faster, shows more socket detail, and reads from the kernel. Every netstat command you rely on, rewritten for ss.

echo is convenient but inconsistent across systems; printf is portable and precise, know when to use each and avoid the gotchas.

Count files in a directory (recursively or not) with find, ls, and tree, quick one-liners for when du just isn't telling you enough.

Your disk is full and du is lying to you. ncdu, df, and find tricks to track down space hogs before your server goes down at 2 AM.

Extract tar.gz, tar.bz2, tar.xz, flags demystified, compression compared, directory extraction, and the gotchas that trip you up.

Use su with a specific shell to switch users without the default login shell, useful when /etc/passwd points to something unexpected.

Master MySQL from the command line: connect, query databases, manage users, repair tables, optimize, everything you keep Googling, one reference.