Error: Failure while executing; `/bin/launchctl bootstrap gui/501 /Users/<myUserName>/Library/LaunchAgents/homebrew.mxcl.mysql@8.0.plist` exited with 5.

homebrew 给的提示看不到具体消息

查看 homebrew.mxcl.mysql@8.0.plist文件，能看到具体的启动命令

<?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>KeepAlive</key><true/><key>Label</key><string>homebrew.mxcl.mysql@8.0</string><key>LimitLoadToSessionType</key><array><string>Aqua</string><string>Background</string><string>LoginWindow</string><string>StandardIO</string><string>System</string></array><key>ProgramArguments</key><array><string>/usr/local/opt/mysql@8.0/bin/mysqld_safe</string><string>--datadir=/usr/local/var/mysql</string></array><key>RunAtLoad</key><true/><key>WorkingDirectory</key><string>/usr/local/var/mysql</string>
</dict>
</plist>

然后直接用/usr/local/opt/mysql@8.0/bin/mysqld_safe命令启动，看到具体报错信息，提示权限不够，发现有个文件夹用户组不对，改下用户组就好了