Unix Resources

Westwind’s reference page.

Man Pagez or Man Pages

The X-Lab

Elevated Shell Shell as actual root user sudo su.

Alternatively, sudo -s gives you elevated permissions but your home is still your home. If you just want to change to an admin user in Terminal type su <admin username>. Change user in shell: su <any-user-name>

Spotlight:sudo mdutil -E /  Or, more specifically, sudo mdutil -E /Volumes/[DriveName]

Also try, sudo launchctl unload -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist

sudo launchctl load -w /System/Library/LaunchDaemons/com.apple.metadata.mds.plist

flush DNS Cache

Turn off Mail preview of attachments – defaults write com.apple.mail DisableInlineAttachmentViewing -bool yes (or false)

Copy only email address in Mail – defaults write com.apple.mail AddressesIncludeNameOnPasteboard -bool false (or no)

List files in a directory and output the list  to a text file on the hard drive: ls > ~/list-of-files.txt

Disk Usage (this takes a while to run) sudo du -sh /* du man page: https://ss64.com/osx/du.html     Some of my favorite options:

-d depth Display an entry for all files and folders depth folders deep.
-h “Human-readable” output.
-k KB Display block counts in 1024-byte (1-Kbyte) blocks.
-m MB Display block counts in 1048576-byte (1-Mbyte) blocks.
-g GB Display block counts in 1073741824-byte (1-Gbyte) blocks.
-c Display a grand total.

Display Free Disk Space  df -hT hfs and its Man page: https://ss64.com/osx/df.html

MemTest cd /usr/bin, memtest all, CTRL C. Instructions can be found on this page.

Enable Disk Utility’s debug menu  defaults write com.apple.DiskUtility DUDebugMenuEnabled 1  (change 1 to 0 to disable the debug menu)

chflags hidden /FilePath or chflags no hidden or SetFile -a V filename.txt or use a .

Clear font caches and databases: sudo atsutil databases -remove or get FontNuke

Diff lets you compare files or folders, diff file-1 file-2 or diff -rq folder-1 folder-2. Example, diff -rq [path to folder 1] [path to folder 2] > ~/Desktop/comparison.txt

This command will provide a nice list of files that occur in dirA but not in dirB, files that occur in dirB, but not in dirA, and files that differ between dirA and dirB. Pipe the output through grep to remove mention of uninteresting files, and sort to tidy it up, e.g.:
diff -qr dirA dirB | grep -v -e ‘DS_Store’ -e ‘Thumbs’ |
sort > diffs.txt

List of Defaults commands

MacAdmins’ favorites

touch ~/timestamp and then change some setting and then find -x / -newer ~/timestamp >~/changedfiles.txt” to generate a list of changed files, and store it in your home directory under the name “changedfiles.txt”. One of these changed files should be the settings file you need to locate.

Enter date XXXX and press Return  format: [mm][dd][HHMM][yy]

For installers with expired certs use Terminal to change date to 0201010116 This should work for Lion, Mountain Lion and Mavericks, 10.7, 10.8 and 10.9

Make Install Media examples:Apple support article

Remember that it is 2 dashes, not an em dash

sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia –volume /Volumes/16GBigSur

sudo /Applications/Install\ macOS\ Catalina.app/Contents/Resources/createinstallmedia –volume /Volumes/15

sudo /Applications/Install\ macOS\ Mojave.app/Contents/Resources/createinstallmedia –volume /Volumes/14

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/13

sudo /Applications/Install\ macOS\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/12 –applicationpath /Applications/Install\ macOS\ Sierra.app

sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia –volume /Volumes/MyVolume

sudo /Applications/Install\ OS\ X\ El\ Capitan.app/Contents/Resources/createinstallmedia –volume /Volumes/11 –applicationpath /Applications/Install\ OS\ X\ El\ Capitan.app

sudo /Applications/Install\ OS\ X\ Yosemite.app/Contents/Resources/createinstallmedia –volume /Volumes/10 –applicationpath /Applications/Install\ OS\ X\ Yosemite.app

/createinstallmedia –volume /Volumes/9 –applicationpath /Applications/Install\ OS\ X\ Mavericks.app –nointeraction

Mountain Lion OS X 10.8 http://osxdaily.com/2012/02/17/make-bootable-os-x-10-8-mountain-lion-usb-install-drive/

Lion and Mountain Lion and newer http://www.sallonoroff.co.uk/blog/2015/11/make-a-bootable-usb-drive-with-createinstallmedia/

Leopard and Snow Leopard https://www.macworld.com/article/2023548/dvd-less-snow-leopard-installation-on-older-mac.html

View All Third Party Kernel Extensions kextstat | grep -v com.apple

Unload Kernel Extension sudo kextunload /System/Library/Extensions/ThirdPartyMystery.kext

System Integrity Protection (SIP), aka rootless csrutil enable and csrutil disable

Disable Time Machine local backups: sudo tmutil disablelocal

The application SomeApp.app can’t be opened. Superuser.com Question 898124  chmod +x SomeApp.app/Contents/MacOS/*

Sierra installer payload failed signature check, resolved by checking date and seeing that it was set to the year 2000. Within Terminal I typed ntpdate -u time.apple.com to resolve this issue.

Spotlight commands

Encrypted zip archive zip -ej ~/Desktop/file.zip ~/Desktop/Kitties.JPG

unzip file.zip -d ~/another/folder

Trigger Setup Assistant so you can create a new admin-level account. mount -uw / then rm /var/db/.applesetupdone

rm -rf some_dir r “recursive” -f “force” (suppress confirmation messages)

Disable Gatekeeper sudo spctl –master-disable

defaults write com.apple.DiskUtility DUDebugMenuEnabled 1 and then killall Finder then open Disk Utility, go to the Debug menu and select Show All Partitions

Time Machine tmutil info https://eclecticlight.co/2017/02/16/diagnosing-and-treating-time-machine-problems-in-terminal/

sudo /usr/sbin/softwareupdate –ignore “macOS Catalina”

 

Tim is one of those people who inspires complete confidence. He goes beyond the call of duty to follow up after technical support visits and to make sure everything is going well. He is efficient, thorough and does his research before a site visit to make sure no time is wasted and that his solutions are appropriate. He also is very easy to be around, with a working sense of humor– an added blessing for someone working in a home office. I would not hesitate to recommend him to any of my colleagues for computer support.

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