sudo: /Applications/Install macOS High Sierra.app/Contents/Resources/createinstallmedia: command not found ????
Unable to complete create bootable installer for Mac OS pro?
MacBook Pro
How to create a bootable installer for macOS - Apple Support
Make sure that your command is formatted correctly. Instead of typing the command, try copying the following:
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/[MyVolume]
If you're running macOS Sierra or earlier on your Mac, you might need to try this argument instead:
sudo /Applications/Install\ macOS\ High\ Sierra.app/Contents/Resources/createinstallmedia --volume /Volumes/[MyVolume] --applicationpath /Applications/Install\ macOS\ High\ Sierra.app