nmc@N310nightly-a:/$ !bash                                                      
You are about to enter the Unix ("raw") shell and execute low-level Unix command(s). Warning: using low-level Unix commands is not recommended! Execute?  Yes

root@N310nightly-a:/volumes# nmc -c "setup plugin simple-encryption uninstall -y" 
Plugin 'simple-encryption' was successfully removed!
To activate changes, NMS needs to be restarted.
Trying to gain exclusive access to the appliance.
This operation may take up to 30 seconds to complete. Please wait...
Exclusive access granted.
Restarting NMS. Please wait...
NMS was successfully restarted
root@N310nightly-a:/volumes# nmc -c "setup plugin install simple-encryption -y" >> /files/logfile.log
root@N310nightly-a:/volumes# 

Shell froze here. Have to close the session and re-login to bring it back.