Topic : mount_smbfs: mount error: /Volumes/test: File exists

I have no SMB shares to try with, but have you tried using any of the mount command examples at the end of the man page for mount_smbfs? mount_smbfs calls the mount command to do its job. Using mount may help isolate your issue.

In all cases, though, you should use mkdir to create the mount point prior to calling mount/mount_smbfs. Your text didn't make it clear you were always doing so.

Are the examples you're showing the exact statements you are executing, or are you using environment variables to populate or any else that might permute the statements?

If by chance you are executing these in a script with environment variables it might be helpful to copy the execution line and echo it to the terminal to verify it is resulting in exactly what you expect.

Also, I noticed that mount_afp has the same syntax as mount_smbfs except that mount_afp includes 'afp:' before the two slashes. Might be worth a try to add 'smb:' or 'smbfs:'. The statement I use to mount my AFP shares is:

mount_afp afp://username:password@host/share /Volumes/share

Also, a handy way to get the password without hardcoding in your script is to use the 'security' command similar to the following:

set USER=`id -un`
setenv PASSWORD `security find-generic-password -g -a $USER |& grep password | cut -f2 -d\"`

Please disregard my suggestion about adding 'smb:' or 'smbfs:'. It will not work.