Join of output from DF and LSBLK Linux commands via bash - linux

Question

I need to merge two outputs in Linux.
This:
lsblk -n -b --output KNAME,NAME,SIZE,MOUNTPOINT | grep -v "fd0" | grep -v "loop" | grep -v "sr0" | grep -v "hdc" | grep -v "cdrom"
In a result I have:
sda sda 53687091200
sda1 └─sda1 53684994048
dm-3 └─dockerVG-rootLV 53682896896 /
sdb sdb 2147483648000
sdb1 └─sdb1 2147482599424
dm-1 ├─hddVG-dockerLV 536866717696 /var/lib/docker
dm-2 └─hddVG-hddLV 1610612736000 /dockerhdd
sdc sdc 536870912000
sdc1 └─sdc1 536869863424
dm-0 └─ssdVG-ssdLV 536866717696 /dockerssd
And this:
df --exclude={tmpfs,devtmpfs,squashfs,overlay} | sed -e /^Filesystem/d | awk '{print $6 " " $1 " " $3 " " $4 " " $5}'
In a result I have:
/ /dev/mapper/dockerVG-rootLV 8110496 40591632 17%
/dockerssd /dev/mapper/ssdVG-ssdLV 214133656 274642488 44%
/dockerhdd /dev/mapper/hddVG-hddLV 83278236 1385191240 6%
/var/lib/docker /dev/mapper/hddVG-dockerLV 76046204 412729940 16%
So, I want to Join via these points /, /var/lib/docker, /dockerhdd, /dockerssd.
Important! I want to check this in another place, where we will have another mount points. Also I have to save structure of first output without sorting.
In a result I have to receive something like this:
sda sda 53687091200
sda1 └─sda1 53684994048
dm-3 └─dockerVG-rootLV 53682896896 / /dev/mapper/dockerVG-rootLV 8110496 40591632 17%
sdb sdb 2147483648000
sdb1 └─sdb1 2147482599424
dm-1 ├─hddVG-dockerLV 536866717696 /var/lib/docker /dev/mapper/hddVG-dockerLV 76046204 412729940 16%
dm-2 └─hddVG-hddLV 1610612736000 /dockerhdd /dev/mapper/hddVG-hddLV 83278236 1385191240 6%
sdc sdc 536870912000
sdc1 └─sdc1 536869863424
dm-0 └─ssdVG-ssdLV 536866717696 /dockerssd /dev/mapper/ssdVG-ssdLV 214133656 274642488 44%
Of course better to have one-liner, but if it is not possible, we can send output to separate files and join them. Could You please help me in this ?

Answer 1

Using awk:
awk '!/^\/&^fd0&^loop&^sr0&^hdc&^cdrom/ { print $0" "arr[$4] } /^Filesystem/ { mrk=1;next } mrk==1 && /^\// { arr[$1]=$0 }' <<< $(df --exclude={tmpfs,devtmpfs,squashfs,overlay};lsblk -n -b --output KNAME,NAME,SIZE,MOUNTPOINT)
Redirect the two commands back into awk, stripping out any grep and sed processing. We process the df command first and where we find a line beginning with "Filesystem" we set a marker (mrk) to 1 and move to the next line. We then create an array (arr) indexed with the mountpoint and containing the line returned from the df command. We move onto the lsblk command and search for the lines starting with the KNAMEs required. We print the line from the lsblk command and append the value in the arr array indexed by the mount point ($4)