struggling with grep (even if I'm sure it is so simple)

[AdvancedNoob]

Hi Nation,
(total noob so sorry if this is a dumb request)

context: pre imaging partition

I want to do a simple thing but cannot find online how to do it:
-I have 2 disks, both have a partition with an Apple_hfs type
-I want to grep the disk of only one by doing:

diskutil list | grep GUID_partition_scheme | grep -v ???? | awk '{print$5}'

I want to exclude

/dev/disk2 (disk image): #: TYPE NAME SIZE IDENTIFIER 0: GUID_partition_scheme +68.7 GB disk2 1: EFI EFI 209.7 MB disk2s1 2: Apple_HFS Netboot-Sierra-062018 68.4 GB disk2s2

and use Netboot-Sierra-062018 with the switch -v

any ideas?

(hope all of this makes sense)

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

[james_spencer]

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

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

[Volker]

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

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

[AdvancedNoob]

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.

[athomson]

This should do the trick:

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

[AdvancedNoob]

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

[m_donovan]

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?

[AdvancedNoob]

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

[m_donovan]

You could try:

diskutil list internal

This should only include the disk0 in your example.

[AdvancedNoob]

@m.donovan works perfectly like I wanted! thanks