launchctl

# dump all the launchd services 
launchctl print gui/$UID

# dump details of the service
launchctl print gui/$UID/com.blakegarner.vault

# stop service and unload from launchd
launchctl bootout gui/$UID/com.blakegarner.vault

# start the servcie and load plist from disk
launchctl bootstrap gui/$UID ~/Library/LaunchAgents/com.blakegarner.vault.plist

# disable service leaving process running
launchctl disable gui/$UID/com.blakegarner.vault

# enable service 
launchctl enable gui/$UID/com.blakegarner.vault

# kill and then start the service outputting the pid
launchctl kickstart -kp gui/$UID/com.blakegarner.vault

# just kill the service process. Service state ends up funky
launchctl kill 9 gui/$UID/com.blakegarner.vault