As long as you already have a job set up and saved, you can run the job from the command prompt without opening Abaqus CAE. The job in this example is named "Job-1".
Open the command prompt and step in to the folder where the job is located with the command:
Next, type in:
abaqus j=<jobname> cpus=<number of cpus>
If the job already exists overwrite with a "y".
In the same folder you will get a log file named <jobname>.log where you can open with notepad and see how many licenses were checked out and how many remain available.