jingrong176 wrote:
SHould have mad my problem more clear, for what I ran on Terminal command:
sudo /Applications/Install\ macOS\ Big\ Sur.app/Contents/Resources/createinstallmedia --volume /Volumes/usbdrive
the "Install" does not exist, so command can't run.
Correct, because you are not understanding the importance of the backslash escape sequence to process spaces in a file/folder name. The "\ " part between several of the workds means to insert a space in the name (which happens to be a folder name here). So with all the escape sequences taken into account, you are looking at a folder name (or also in this case an application bundle name) of "Install macOS Big Sur.app".
When working on the command line spaces in a path cause problems so they need to be "coded" into the name so the Finder will show:
Install macOS Big Sur.app
But on the command line this is required:
Install\ macOS\ Big\ Sur.app
Technically there is another way, but that may just cause more confusion since this is just an explanation for what you are seeing.
FYI, when asking for any assistance involving the Terminal app & command line, then you must post the exact command used and any error messages because the command line is very unforgiving. Every little thing matters regarding spaces and the case of a character, etc.
Do you have the "Install macOS Big Sur" app in the Applications folder? Check in the Finder to be sure, because that app must first exist before you can run any Terminal commands which require or reference it.