I wasn't able to find a way to do this with the CLI natively, but if you don't mind PowerShell, it should be fairly easy to get the output you want.
# Open connection to NetApp controller
Connect-NcController <controller hostname>
# Run SSH command and store output as variable named $autostate
$autostate = Invoke-NcSsh -Command "set d; y; vol efficiency status -vserver EU51SVMP016 -volume * -l"
# Output is a multi-line string stored as one large string, so we'll split it into multiple strings delimited by a new line
$autostate = $autostate -split "`n"
# Now we can select the strings we want for the output. I've selected the "Path" and "Auto State" strings
$autostate | Select-String -Pattern "Auto State","Path"
Output looks like this:
Path: /vol/path1 Auto State: - Path: /vol/path2 Auto State: - Path: /vol/path3 Auto State: - Path: /vol/path4 Auto State: - Path: /vol/path5 Auto State:
Oh yeah, I should have clarified that I wasn't able to find the command in the CLI natively on my systems running 9.3. That command might exist in 9.4 or 9.5 too if you're running that and would be WAY easier than my little script.