rubenarakelyan

Change macOS password in single user mode

1. Hold ⌘+S on startup
2. mount -uw / (fsck -fy is not needed)
3. launchctl load /System/Library/LaunchDaemons/com.apple.opendirectoryd.plist (or /System/Library/LaunchDaemons/com.apple.DirectoryServices.plist in 10.6)
4. dscl . passwd /Users/username (without a trailing slash) and enter a new password. You can ignore the error about com.apple.DirectoryServices.plist.
5. reboot

rubenarakelyan

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
	<key>Backend</key>
	<string>QEMU</string>
	<key>ConfigurationVersion</key>
	<integer>4</integer>
	<key>Display</key>
	<array>

rubenarakelyan

# Allow localhost traffic
iptables -A INPUT -i lo -j ACCEPT

# INVALID type packets should be DROPped regardless of source.
iptables -A INPUT -m state --state INVALID -j DROP

# Allow traffic for related/established connections already running
iptables -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT

rubenarakelyan

sudo apt-get remove --purge bluej*
sudo apt-get remove --purge chromium*
sudo apt-get remove --purge libreoffice*
sudo apt-get remove --purge scratch*
sudo apt-get remove --purge vlc*
sudo apt-get remove --purge wolfram*
sudo apt-get clean
sudo apt-get autoremove

rubenarakelyan

Disconnect all connected clients

SELECT pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE datname = 'mydb';

rubenarakelyan

Copy search results to clipboard

• CTRL + F
• Type your search string
• CTRL + SHIFT + L to select all occurrences found (max. 999)
• ESC (or close search dialog with top-right X)
• CTRL + I to select whole lines
• CTRL + C
• Open new file
• CTRL + V

rubenarakelyan

Mount FAT32 partition in macOS with write permissions

diskutil list
sudo diskutil unmount /dev/disk2s1
sudo mkdir /Volumes/NAME
sudo mount -w -t msdos /dev/disk2s1 /Volumes/NAME

Convert HEIC images to JPEG and delete originals

rubenarakelyan

Find files from a list

while read -r file
do
  find . -name "$file"
done < list.txt

Convert JSON to CSV

rubenarakelyan

Zip a folder

zip -r [archive] [folder]

Zip a folder and encrypt with a password

zip -er [archive] [folder]

rubenarakelyan

Squash commits

git rebase -i origin

Force push without changes

git commit --amend --no-edit && git push -f

Change file permissions