diskutil list | awk '/GUID_partition_scheme/{print $5}'

you can use AWK command to search and print out the column you need

PS: how do you pronounce grep? g-rep or grrep?

It's just "grep". Rhymes with "strep" and "hep".

thanks @james.spencer but GUID_partition_scheme will print 2 results in my case, and I need a command to remove one and get only one print.

This should do the trick:

diskutil list | awk '/Apple_HFS Netboot-Sierra/ {print$5}'

thanks @athomson but I think I screwed up my explanation because this is not what I want. lol

pic speaks louder that my English :)
(ignore disk1 in the pic)
I need to grep disk0 to partition before imaging, my problem is GUID-partition_scheme is shown on 2 disks so when I run

cheese=$(diskutil list | grep GUID_partition_scheme | '{print$5}')

it returns 2 results so I cannot run

diskutil partitionDisk $cheese 3 GPT JHFS+ Imac 30% JHFS+ Data 40% MS-DOS BOOTCAMP R;

Hope all of this makes sense, I m all new to this.

tia

It appears that you are attempting to dual boot systems. Will you always be partitioning disk0 or will it be possible to need to partition say disk2 for some reason?

@m.donovan in theory it is always disk0 but we never know, hence using variable to make sure it is always consistent

You could try:

diskutil list internal

This should only include the disk0 in your example.

@m.donovan works perfectly like I wanted! thanks