eplt · December 2, 2025 11:49
diff --git a/macOS.txt b/macOS.txt
 -- Automation & Scheduling --

 Classic Cron:
 In terminal, type:
  env EDITOR=nano crontab -e
 To remove all scheduled jobs: crontab -r
 To list all scheduled jobs: crontab -l
 Sample to open Safari every morning:
  0 7 * * * open -a Safari http://www.bbc.com/news
  0 7 * * * open -a Safari http://money.cnn.com
  0 7 * * * open -a Safari https://flipboard.com/section/technology-c5o31di9kg9ea7p6
  0 7 * * * open -a Safari https://www.macrumors.com
  0 7 * * * open -a 'Brave Browser' http://www.bbc.com
 To open Chrome/Brave in new window:
  open -na "Google Chrome" --args --new-window "https://www.bbc.com"
  open -na "Brave Browser" --args --new-window "https://www.bbc.com"

 Modern Scheduling with launchd:
 Paste into ~/Library/LaunchAgents/com.user.safari-opener.plist
 (see online for plist tutorial)

 After saving plist:
  launchctl load ~/Library/LaunchAgents/com.user.safari-opener.plist
  launchctl list | grep safari-opener
  launchctl unload ~/Library/LaunchAgents/com.user.safari-opener.plist

 File/Folder Change Monitoring (Automation):
 brew install fswatch
 fswatch -o ~/Downloads | xargs -n1 -I {} echo "File changed"


 -- System Management --

 Change screenshot folder:
 defaults write com.apple.screencapture location ~/Screenshots; killall SystemUIServer

 Disk checklist:
 diskutil list
 sudo /sbin/fsck_hfs -drfy /dev/disk2s3
 Interactive disk space analysis:
 brew install ncdu
 ncdu ~
 sudo ncdu /


 -- Performance & Monitoring --

 Give process full priority:
 sudo renice -20 $(pgrep FaceTime)
 Process monitoring:
 brew install htop
 htop
 vm_stat
 ps aux --sort=-%mem | head -20
 powermetrics -n 1 --samplers cpu_power,gpu_power


 -- File & Batch Operations --

 Loop through:
 for dir in *; do echo $dir; done
 for file in *.avi; do echo $file; done
 Delete all .flac:
 find . -name '*.flac' -delete
 Delete PDFs below 1KB:
 find . -type f -name "*.pdf" -size -1k -delete

 Merge TS videos:
 cd ts_files_directory

 echo {1..500}.ts | tr " " "\n" > tslist
 while read line; do cat $line >> combined.ts; done < tslist

 AVI merge:
 brew install mplayer
 mencoder -oac copy -ovc copy 1.avi 2.avi 3.avi 4.avi 5.avi 6.avi -o final.avi

 Merge + Sort MP4s:
 rm list.txt; for f in *.mp4 ; do echo file '$f' >> list.txt; done && sort -V list.txt > list-sort.txt && ffmpeg -f concat -safe 0 -i list-sort.txt -c copy stitched-video.mp4 ; rm list.txt list-sort.txt

 Batch compress multiple files (performance):
 brew install parallel
 ls *.mp4 | parallel --jobs 4 'ffmpeg -i {} -c:v libx264 -preset fast -crf 28 {.}_compressed.mp4'


 -- Development & DevOps --

 SSH key permissions:
 chown root:root ~/.ssh/id_rsa*
 chown user:user ~/.ssh/id_rsa*
 chmod 600 ~/.ssh/id_rsa
 chmod 644 ~/.ssh/id_rsa.pub

 Persistent SSH tunnel:
 ssh -NTf -L localhost:6379:remoteserver.com:6379 [email protected]
 See ~/.ssh/config for more advanced setups.

 Homebrew & Docker troubleshooting on Apple Silicon:
 curl -O https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh
 /bin/bash uninstall.sh --path=/usr/local
 brew install docker
 # Pull correct architecture images:
 docker pull --platform linux/arm64 python:3.11
 # Use buildx for multi-arch:
 docker buildx build --platform linux/amd64,linux/arm64 -t myapp:latest .

 Install MongoDB:
 brew tap mongodb/brew
 brew install mongodb-community
 brew install mongodb-database-tools


 -- Security, Network & Code Signing --

 Remove App Quarantine:
 xattr -d com.apple.quarantine /Applications/Lepton.app
 xattr -r -d com.apple.quarantine "/Applications/full app path"

 Code signing / notarization:
 codesign -f -s - --timestamp=none --all-architectures "/Applications/full app path"
 codesign -v /Applications/YourApp.app
 spctl -a -v /Applications/YourApp.app

 Network diagnostics:
 brew install dig mitmproxy nethogs
 mitmproxy -p 8080
 curl -x 127.0.0.1:8080 https://api.example.com/endpoint
 openssl s_client -connect api.example.com:443 -showcerts
 netstat -in
 sudo nethogs


 -- Reference & Quick Tools --

 iCloud Drive folder:
 $HOME/Library/Mobile\ Documents/com~apple~CloudDocs
 $HOME/Library/Mobile\ Documents

 Backup dotfiles:
 mkdir -p ~/dotfiles
 cp ~/.ssh/config ~/.gitconfig ~/.zshrc ~/dotfiles/
 ln -sf ~/dotfiles/.zshrc ~/.zshrc
 cd ~/dotfiles
 git init
 git add .
 git commit -m "Initial config backup"
 git remote add origin [email protected]:yourusername/dotfiles.git
 git push -u origin main

 Split big folder into chunks of 1000 files:
 i=0; for f in *; do d=dir_$(printf %03d $((i/1000+1))); mkdir -p $d; mv "$f" $d; let i++; done

 Remove NodeJS completely:
 sudo rm /usr/local/bin/npm
 sudo rm /usr/local/share/man/man1/node.1
 sudo rm /usr/local/lib/dtrace/node.d
 sudo rm -rf ~/.npm
 sudo rm -rf ~/.node-gyp
 sudo rm /opt/local/bin/node
 sudo rm /opt/local/include/node
 sudo rm â€“rf /usr/local/bin/node
 sudo rm -rf /opt/local/lib/node_modules
 sudo rm -rf /usr/local/bin/npm
 sudo rm -rf /usr/local/share/man/man1/node.1
 sudo rm -rf /usr/local/lib/dtrace/node.d
 sudo rm -rf /usr/local/lib/node_modules

 System extension cleanup:
 sudo rm -rf /Library/Extensions/<kextname.kext>
 sudo kextcache -i /
 sudo kextcache --clear-staging
 sudo reboot


 -- Apple Silicon Specific --

 CMake fix for x86_64 library:
 set(CMAKE_OSX_ARCHITECTURES "x86_64" CACHE INTERNAL "" FORCE)
 Install Rosetta:
 softwareupdate --install-rosetta


 -- Scripting & Automation --

 AppleScript (Brave tabs to Safari):
 tell application "Brave Browser"
    set tab_list to every tab in the front window
    repeat with the_tab in tab_list
        set the_url to the URL of the_tab
        tell application "Safari" to open location the_url
    end repeat
 end tell

 Send iMessage with osascript:
 osascript -e 'tell application "Messages" to send "Hello World!" to buddy "+1192182919191"'

 Open 2 copies of WeChat:
 nohup /Applications/WeChat.app/Contents/MacOS/WeChat > /dev/null 2>&1 &
 nohup /Applications/ä¼ä¸šå¾®ä¿¡.app/Contents/MacOS/ä¼ä¸šå¾®ä¿¡ > /dev/null 2>&1 &

 Generate random passwords:
 for i in $(seq 1 5); do LANG=C && echo $(tr -dc 'A-Za-z0-9!"#$%&()*+,-./:;<=>?@[\\]^_`{|}~' < /dev/urandom | head -c 20); done

 Hide user account from login screen:
 sudo dscl . create /Users/<hiddenuser> IsHidden 1


 -- Data Processing & Regex --

 Strip HTML tags (regex):
 \<[^\>]*\>
 Other useful patterns:
 (https?|ftp|ssh)://[^\s/$.?#].[^\s]*      # URL
 [a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,} # Email
 \d+\.?\d*                                # Number
 [a-fA-F0-9]{32}|[a-fA-F0-9]{64}           # MD5/SHA256
 \b[13][a-km-zA-HJ-NP-Z1-9]{25,34}\b         # Bitcoin Address
 "([^"\\]|\\.)*"                         # JSON String
 0x[a-fA-F0-9]{40}                         # Ethereum

 Python one-liners:
 Parse JSON:
 curl -s https://api.example.com/data | python3 -m json.tool | grep "price"
 Extract from CSV:
 python3 -c "import csv;data=[float(row['price']) for row in csv.DictReader(open('prices.csv'))];print(f'Mean: {sum(data)/len(data)}, Max: {max(data)}')"
 Extract URLs from text:
 cat document.txt | python3 -c "import sys, re; print('\\n'.join(re.findall(r'https?://\\S+', sys.stdin.read())))"
 Batch rename .txt to .md:
 python3 -c "import os, re; [os.rename(f, re.sub(r'\\.txt$', '.md', f)) for f in os.listdir('.') if f.endswith('.txt')]"
 Count lines of code:
 find . -name "*.py" -type f -exec wc -l {} + | tail -1

 Batch extract EPUB text:
 for epub in *.epub; do
  echo "Processing $epub..."
  unzip -q -c "$epub" | strings | grep -v "^$" > "${epub%.epub}.txt" 2>/dev/null && \
  echo "âœ“ $epub processed" || echo "âœ— Failed: $epub"
 done

 -- Miscellaneous --

 Install common CLI tools:
 brew install mplayer htop ncdu parallel mitmproxy docker mongodb/brew fdupes fswatch dig nethogs

 Find and remove duplicates:
 fdupes -r .
 fdupes -rdN .

 Download many URLs with curl:
 cat urls.txt | xargs -0 curl -O

 Preserve folder structure when copying files:
 rsync -a --include '*/' --include '*.pdf' --include '*.jpg' --exclude '*' source_folder/ destination_folder/
	-- Automation & Scheduling --

	Classic Cron:
	In terminal, type:
	env EDITOR=nano crontab -e
	To remove all scheduled jobs: crontab -r
	To list all scheduled jobs: crontab -l
	Sample to open Safari every morning:
	0 7 * * * open -a Safari http://www.bbc.com/news
	0 7 * * * open -a Safari http://money.cnn.com
	0 7 * * * open -a Safari https://flipboard.com/section/technology-c5o31di9kg9ea7p6
	0 7 * * * open -a Safari https://www.macrumors.com
	0 7 * * * open -a 'Brave Browser' http://www.bbc.com
	To open Chrome/Brave in new window:
	open -na "Google Chrome" --args --new-window "https://www.bbc.com"
	open -na "Brave Browser" --args --new-window "https://www.bbc.com"

	Modern Scheduling with launchd:
	Paste into ~/Library/LaunchAgents/com.user.safari-opener.plist
	(see online for plist tutorial)

	After saving plist:
	launchctl load ~/Library/LaunchAgents/com.user.safari-opener.plist
	launchctl list \| grep safari-opener
	launchctl unload ~/Library/LaunchAgents/com.user.safari-opener.plist

	File/Folder Change Monitoring (Automation):
	brew install fswatch
	fswatch -o ~/Downloads \| xargs -n1 -I {} echo "File changed"


	-- System Management --

	Change screenshot folder:
	defaults write com.apple.screencapture location ~/Screenshots; killall SystemUIServer

	Disk checklist:
	diskutil list
	sudo /sbin/fsck_hfs -drfy /dev/disk2s3
	Interactive disk space analysis:
	brew install ncdu
	ncdu ~
	sudo ncdu /


	-- Performance & Monitoring --

	Give process full priority:
	sudo renice -20 $(pgrep FaceTime)
	Process monitoring:
	brew install htop
	htop
	vm_stat
	ps aux --sort=-%mem \| head -20
	powermetrics -n 1 --samplers cpu_power,gpu_power


	-- File & Batch Operations --

	Loop through:
	for dir in *; do echo $dir; done
	for file in *.avi; do echo $file; done
	Delete all .flac:
	find . -name '*.flac' -delete
	Delete PDFs below 1KB:
	find . -type f -name "*.pdf" -size -1k -delete

	Merge TS videos:
	cd ts_files_directory

	echo {1..500}.ts \| tr " " "\n" > tslist
	while read line; do cat $line >> combined.ts; done < tslist

	AVI merge:
	brew install mplayer
	mencoder -oac copy -ovc copy 1.avi 2.avi 3.avi 4.avi 5.avi 6.avi -o final.avi

	Merge + Sort MP4s:
	rm list.txt; for f in *.mp4 ; do echo file '$f' >> list.txt; done && sort -V list.txt > list-sort.txt && ffmpeg -f concat -safe 0 -i list-sort.txt -c copy stitched-video.mp4 ; rm list.txt list-sort.txt

	Batch compress multiple files (performance):
	brew install parallel
	ls *.mp4 \| parallel --jobs 4 'ffmpeg -i {} -c:v libx264 -preset fast -crf 28 {.}_compressed.mp4'


	-- Development & DevOps --

	SSH key permissions:
	chown root:root ~/.ssh/id_rsa*
	chown user:user ~/.ssh/id_rsa*
	chmod 600 ~/.ssh/id_rsa
	chmod 644 ~/.ssh/id_rsa.pub

	Persistent SSH tunnel:
	ssh -NTf -L localhost:6379:remoteserver.com:6379 [email protected]
	See ~/.ssh/config for more advanced setups.

	Homebrew & Docker troubleshooting on Apple Silicon:
	curl -O https://raw.githubusercontent.com/Homebrew/install/HEAD/uninstall.sh
	/bin/bash uninstall.sh --path=/usr/local
	brew install docker
	# Pull correct architecture images:
	docker pull --platform linux/arm64 python:3.11
	# Use buildx for multi-arch:
	docker buildx build --platform linux/amd64,linux/arm64 -t myapp:latest .

	Install MongoDB:
	brew tap mongodb/brew
	brew install mongodb-community
	brew install mongodb-database-tools


	-- Security, Network & Code Signing --

	Remove App Quarantine:
	xattr -d com.apple.quarantine /Applications/Lepton.app
	xattr -r -d com.apple.quarantine "/Applications/full app path"

	Code signing / notarization:
	codesign -f -s - --timestamp=none --all-architectures "/Applications/full app path"
	codesign -v /Applications/YourApp.app
	spctl -a -v /Applications/YourApp.app

	Network diagnostics:
	brew install dig mitmproxy nethogs
	mitmproxy -p 8080
	curl -x 127.0.0.1:8080 https://api.example.com/endpoint
	openssl s_client -connect api.example.com:443 -showcerts
	netstat -in
	sudo nethogs


	-- Reference & Quick Tools --

	iCloud Drive folder:
	$HOME/Library/Mobile\ Documents/com~apple~CloudDocs
	$HOME/Library/Mobile\ Documents

	Backup dotfiles:
	mkdir -p ~/dotfiles
	cp ~/.ssh/config ~/.gitconfig ~/.zshrc ~/dotfiles/
	ln -sf ~/dotfiles/.zshrc ~/.zshrc
	cd ~/dotfiles
	git init
	git add .
	git commit -m "Initial config backup"
	git remote add origin [email protected]:yourusername/dotfiles.git
	git push -u origin main

	Split big folder into chunks of 1000 files:
	i=0; for f in *; do d=dir_$(printf %03d $((i/1000+1))); mkdir -p $d; mv "$f" $d; let i++; done

	Remove NodeJS completely:
	sudo rm /usr/local/bin/npm
	sudo rm /usr/local/share/man/man1/node.1
	sudo rm /usr/local/lib/dtrace/node.d
	sudo rm -rf ~/.npm
	sudo rm -rf ~/.node-gyp
	sudo rm /opt/local/bin/node
	sudo rm /opt/local/include/node
	sudo rm â€“rf /usr/local/bin/node
	sudo rm -rf /opt/local/lib/node_modules
	sudo rm -rf /usr/local/bin/npm
	sudo rm -rf /usr/local/share/man/man1/node.1
	sudo rm -rf /usr/local/lib/dtrace/node.d
	sudo rm -rf /usr/local/lib/node_modules

	System extension cleanup:
	sudo rm -rf /Library/Extensions/<kextname.kext>
	sudo kextcache -i /
	sudo kextcache --clear-staging
	sudo reboot


	-- Apple Silicon Specific --

	CMake fix for x86_64 library:
	set(CMAKE_OSX_ARCHITECTURES "x86_64" CACHE INTERNAL "" FORCE)
	Install Rosetta:
	softwareupdate --install-rosetta


	-- Scripting & Automation --

	AppleScript (Brave tabs to Safari):
	tell application "Brave Browser"
	set tab_list to every tab in the front window
	repeat with the_tab in tab_list
	set the_url to the URL of the_tab
	tell application "Safari" to open location the_url
	end repeat
	end tell

	Send iMessage with osascript:
	osascript -e 'tell application "Messages" to send "Hello World!" to buddy "+1192182919191"'

	Open 2 copies of WeChat:
	nohup /Applications/WeChat.app/Contents/MacOS/WeChat > /dev/null 2>&1 &
	nohup /Applications/ä¼ä¸šå¾®ä¿¡.app/Contents/MacOS/ä¼ä¸šå¾®ä¿¡ > /dev/null 2>&1 &

	Generate random passwords:
	for i in $(seq 1 5); do LANG=C && echo $(tr -dc 'A-Za-z0-9!"#$%&()*+,-./:;<=>?@[\\]^_`{\|}~' < /dev/urandom \| head -c 20); done

	Hide user account from login screen:
	sudo dscl . create /Users/<hiddenuser> IsHidden 1


	-- Data Processing & Regex --

	Strip HTML tags (regex):
	\<[^\>]*\>
	Other useful patterns:
	(https?\|ftp\|ssh)://[^\s/$.?#].[^\s]* # URL
	[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\.[a-zA-Z]{2,} # Email
	\d+\.?\d* # Number
	[a-fA-F0-9]{32}\|[a-fA-F0-9]{64} # MD5/SHA256
	\b[13][a-km-zA-HJ-NP-Z1-9]{25,34}\b # Bitcoin Address
	"([^"\\]\|\\.)*" # JSON String
	0x[a-fA-F0-9]{40} # Ethereum

	Python one-liners:
	Parse JSON:
	curl -s https://api.example.com/data \| python3 -m json.tool \| grep "price"
	Extract from CSV:
	python3 -c "import csv;data=[float(row['price']) for row in csv.DictReader(open('prices.csv'))];print(f'Mean: {sum(data)/len(data)}, Max: {max(data)}')"
	Extract URLs from text:
	cat document.txt \| python3 -c "import sys, re; print('\\n'.join(re.findall(r'https?://\\S+', sys.stdin.read())))"
	Batch rename .txt to .md:
	python3 -c "import os, re; [os.rename(f, re.sub(r'\\.txt$', '.md', f)) for f in os.listdir('.') if f.endswith('.txt')]"
	Count lines of code:
	find . -name "*.py" -type f -exec wc -l {} + \| tail -1

	Batch extract EPUB text:
	for epub in *.epub; do
	echo "Processing $epub..."
	unzip -q -c "$epub" \| strings \| grep -v "^$" > "${epub%.epub}.txt" 2>/dev/null && \
	echo "âœ“ $epub processed" \|\| echo "âœ— Failed: $epub"
	done

	-- Miscellaneous --

	Install common CLI tools:
	brew install mplayer htop ncdu parallel mitmproxy docker mongodb/brew fdupes fswatch dig nethogs

	Find and remove duplicates:
	fdupes -r .
	fdupes -rdN .

	Download many URLs with curl:
	cat urls.txt \| xargs -0 curl -O

	Preserve folder structure when copying files:
	rsync -a --include '/' --include '.pdf' --include '.jpg' --exclude '' source_folder/ destination_folder/
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