General :: Unzip To Same Directory As Zipped File?

So I have a script that simply unzips a file with a line:

unzip /path/to/file.zip

which unzips and puts the unzipped directory in the same directory as my script. The issue is, I want the unzipped directory to be in the same directory as the original zipped file.

I googled and found the -d flag which would let me specify what directory to put it in but the script asks the user to define the directory so I don't see how I could use that (because the user specifies the path all the way to the zipped file, not just the directory where the zipped file is)