[SOLVED] Is there any specific way to extract SSD name without "/"?

Issue

In my current system, I have 3 SSDs, sda, sdb and sdc. The OS is installed in sdc. I am trying to extract the SSDs without the OS installed in it. So, this command

echo $(eval $(lsblk -oMOUNTPOINT,PKNAME -P | grep 'MOUNTPOINT="/"'); echo $PKNAME | sed 's/[0-9]*$//')

returns sdc. But if I want the drive without OS, how should I modify the above command?

grep 'MOUNTPOINT!="/"' doesn't return anything.

The bash script provided by Renaud works as expected on systems with raw drives. In case, if the system has LVM partitions then it returns only dm-1. How to handle this case? To get the correct SSD name on either raw or LVM systems? On the LVM system, lsblk returns. The expected output is sdb

 NAME                MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
    sda                  8:0    0  1.8T  0 disk
    ├─sda1               8:1    0  512M  0 part /boot/efi
    ├─sda2               8:2    0    1G  0 part /boot
    └─sda3               8:3    0  1.8T  0 part
    ├─ubuntu--vg-ubuntu--lv-real
    │                         253:1    0  880G  0 lvm
    │ ├─ubuntu--vg-ubuntu--lv 253:2    0  880G  0 lvm  /
    │ └─ubuntu--vg-clean      253:4    0  880G  0 lvm
    └─ubuntu--vg-clean-cow    253:3    0  400G  0 lvm
      └─ubuntu--vg-clean      253:4    0  880G  0 lvm
    sdb                           8:16   0  1.8T  0 disk

On the raw drive, lsblk returns

NAME   MAJ:MIN RM   SIZE RO TYPE MOUNTPOINT
sda      8:0    0 223.6G  0 disk
sdb      8:16   0 465.8G  0 disk
├─sdb1   8:17   0     2G  0 part
└─sdb2   8:18   0 463.8G  0 part
sdc      8:32   0 232.9G  0 disk
├─sdc1   8:33   0   156M  0 part /boot/efi
├─sdc2   8:34   0  26.7G  0 part /boot
├─sdc3   8:35   0 182.7G  0 part /
└─sdc4   8:36   0  23.4G  0 part [SWAP]

Here the expected output is sda or sdc.

Solution

grep has a -v option to print only non-matching lines. So:

lsblk -oMOUNTPOINT,PKNAME -P | grep -v 'MOUNTPOINT="/"'

should exclude this drive. But note that if you have more than one other drive the rest of your script will not work as you would like. Only the last drive will be considered because it overrides the others. A loop would probably be closer to your needs:

while IFS= read -r line; do
  eval "$line"
  sed 's/[0-9]*$//' <<< "$PKNAME"
done < <(lsblk -oMOUNTPOINT,PKNAME -P | grep -v 'MOUNTPOINT="/"')

Answered By - Renaud Pacalet