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Two columns comparing a PATH before and after macOS path_helper runs: on the left, /opt/homebrew/bin set in ~/.zprofile sits at position 1 above /usr/bin and /bin; on the right, after /etc/zprofile runs path_helper, /opt/homebrew/bin has moved to position 14, below /usr/bin and /bin.

How to Add to PATH on macOS

by Marcus Reeve
July 31, 2026July 19, 2026

Adding a directory to your PATH is how you get macOS to find a command by name instead of typing its full location every time. There’s more than one way to do it, and which…

Dark card headed Mac DFU mode: revive or restore, comparing two operations: REVIVE reinstalls firmware and keeps your data (try first), and RESTORE erases the drive and installs a clean macOS (fallback), with a note that it runs from Finder on a second Mac running macOS 14 or later over USB-C

How to Put a Mac in DFU Mode (and Revive or Restore It)

by Marcus Reeve
July 30, 2026July 21, 2026

DFU mode is the deepest recovery state on a Mac. DFU stands for Device Firmware Update, and you reach for it in the rare case where a Mac will not turn on, stops at a…

Terminal showing the diskutil image subcommands attach, create, info, resize and chpass — the disk-image operations diskutil now shares with hdiutil

hdiutil vs diskutil on macOS: What Each Tool Actually Owns

by Marcus Reeve
July 28, 2026July 19, 2026

The usual one-line answer — hdiutil is for disk image files, diskutil is for physical disks — was clean and correct for years. On macOS 26.5.2 (build 25F84) it’s no longer the whole story, because…

Dark terminal card headed Two ways to hide a file, showing ls -lO output where flagged.txt carries hidden in the file flags column while visible.txt carries a dash, and ls -ldO on the Library folder showing it also carries the hidden flag despite having no dot in its name, with labels reading a leading dot or the hidden flag and user name redacted

How to Show Hidden Files on a Mac

by Marcus Reeve
July 27, 2026July 20, 2026

There is a keyboard shortcut that shows hidden files in the Finder immediately, and for most people that is the entire answer. What trips people up comes after: some files stay out of sight even…

networkQuality -s output showing Downlink at 107.253 Mbps and 403 RPM (Medium responsiveness) versus Uplink at 43.653 Mbps and 44 RPM (Low responsiveness), with RPM defined as round-trips per minute under load

How to Run a Network Speed Test on Mac Without an App (networkQuality)

by Marcus Reeve
July 25, 2026July 18, 2026

Most people reach for speedtest.net or install the Ookla app to check their connection on a Mac. You don’t need either. Since macOS Monterey (macOS 12), every Mac has shipped with networkQuality, a command-line tool…

Dark guide card headed Four ways to get a macOS installer, listing them in order: Apple's page with App Store links plus signed disk images for older releases, the App Store by searching the version name, the Terminal with softwareupdate --list-full-installers, and the open-source Mist which handles installers, ipsw firmware and bootable iso output

macOS Installer Download: Four Official Routes (and Which Reaches What)

by Marcus Reeve
July 24, 2026July 20, 2026

A macOS installer download can come from four different places, all of them Apple’s. Which one works depends entirely on which version you are after. Apple also documents two more routes that upgrade or reinstall…

Terminal showing launchctl list on macOS: one service running with Status 0 and one not running with Status 1, its last exit code — the Status column is the service's last exit code

launchctl on macOS: List, Load, Restart, and Fix launchd Services

by Marcus Reeve
July 22, 2026July 18, 2026

launchctl is the front end to launchd, the process that starts and supervises background services on a Mac — everything from system daemons to the login-item agents your own apps install. Two vocabularies both work:…

Terminal readout of the WIFI section from sudo wdutil info on a Mac, with RSSI -32 dBm (strong signal) and SNR 60 dB highlighted, plus Noise -92 dBm, Tx Rate 1200 Mbps, PHY Mode 11ax (Wi-Fi 6), Channel 5g44/80, and Security WPA3 Personal, and a note that it replaces the removed airport -I command

wdutil on Mac: Check Wi-Fi Signal and Diagnose the Connection from the Terminal

by Marcus Reeve
July 21, 2026July 19, 2026

When you want to see how strong your Wi-Fi actually is from the Terminal — signal, noise, channel, the negotiated rate — wdutil is the built-in tool that answers it on current macOS. It replaced…

Two macOS terminal panels: one running tail -f install.log with fresh softwareupdated lines captioned that new lines mean it is still installing, the other running df -h on the data volume showing available space, captioned to keep 50 GB free before upgrading

Mac Update Stuck? How to Tell If It’s Frozen or Just Working

by Marcus Reeve
July 20, 2026July 20, 2026

A macOS update that looks frozen — the bar stuck in one place for an hour, or “less than a minute remaining” that never ends — is usually still working. A big update spends long…

Two working macOS commands shown in green — netstat -an piped to grep LISTEN to list listening ports, and lsof -i to find the process on a port — above three netstat flags that exit 0 while printing unrelated output

How to List Listening Ports and Find the Process on macOS

by Marcus Reeve
July 17, 2026July 18, 2026

Two questions send most people to netstat on a Mac: which ports are listening, and which process holds one open. On macOS 26.5.2, the first has a one-line answer; the second doesn’t involve netstat at…