To undo a git add, run git reset file or get reset.
git reset filename git reset |
Run git status to check.
git status |
XCode after Catalina Upgrade
I tried running git after the Mac OS Catalina upgrade and got this error.
xcrun: error: invalid active developer path (/Library/Developer/CommandLineTools), missing xcrun at: /Library/Developer/CommandLineTools/usr/bin/xcrun |
Here’s the fix. For some very odd reason, Apple does not automatically reinstall xcode after each Mac OS upgrade.
You will need to either reset it or install it again.
# Try reset first xcode-select --reset # Or install it if reset doesn't work xcode-select --install |
Close your terminal, and reopen and run git again.
Recover MySQL Root Password
How to recover a MySQL root password without a password.
- Stop MySQL.
- Start MySQL Safe Mode.
- Login to MySQL as root without password.
- Change root password.
# Stop MySQL. service mysql stop # MySQL Safe Mode. mysqld_safe --skip-grant-tables & |
# Login to MySQL without password. Set new password. mysql -u root -p use mysql; # For MySQL 5.6 or lower UPDATE mysql.user SET Password=PASSWORD('newpassword') WHERE User='root'; # For MySQL 5.7 or higher SET PASSWORD FOR 'root'@'localhost' = PASSWORD("newpassword"); FLUSH PRIVILEGES; exit; |
# Kill mysqld killall mysqld # Restart MySQL service mysql start |
I ran into issues running MySQL Safe mode. I got a “UNIX socket file don’t exists” error. Here’s the fix.
mkdir -p /var/run/mysqld chown mysql:mysql /var/run/mysqld |
Reset Locked Out Linux User
Perform this command to reset a Linux account that has been locked out due to multiple login failures. This involves resetting the pam_tally back down to zero. Some systems use pam_tally2. First, check what’s the current tally.
Current tally:
pam_tally --user=username pam_tally2 --user=username |
To reset:
pam_tally --user=username --reset pam_tally2 --user=username --reset |