how to print the matching value from same line, which has multiple Delimiter?

Question

I have a File under Linux /tmp/volume.log and the content is:

[id:1091666, name:root, deviceName:/dev/sda, maxStorage:107374182400, unitNumber:0, displayOrder:0, rootVolume:true],[id:1091851, name:/var/log/devops|40GB;/home/devops|150GB, deviceName:/dev/sdb, maxStorage:289910292480, unitNumber:1, displayOrder:1, rootVolume:false]],

It will be in single line. This file is generated by some other script.

My Aim is to find the non-root volume disk and parse it to LVM Commands as Variable to extend or create new volumes, at the time of OS Build.

In the above Example.

There are two disks, 1 - sda which is root disk, (if rootVolume is true it is root disk) 2 - sdb which is non root disk (if rootVolume is false it is non root disk)

I have to grep only

rootVolume=false

and grep then

deviceName:/dev/sdb

followed by:

name:/var/log/devops|40GB;/home/devops|150GB

Once I parse all the above in to Variables, I can call those variables in the Commands like

#!/bin/bash
Disk_name=/dev/sdb
Size_Value=40G
LV_name=var_log_devops
Mount_Point=/var/log/devops

sudo pvcreate $Disk_name
sudo vgcreate vgrp01 $Disk_name 

sudo lvcreate -L $Size_Value -n $var_log_devops vgrp01
sudo mkfs.xfs $var_log_devops
sudo mkdir -p $/var/log/devops
sudo mount $var_log_devops  $/var/log/devops

Right now I am struck with, Extracting the Values from the Text file, becasue they are in single line and multiple Delimiters are present.

Answer 1

How far would this get you:

awk -vRS="]" '/rootVolume:false/ {for (i=1; i<=NF; i++) if ($i ~ /name|deviceName/) print $i}' file
name:/var/log/devops|40GB;/home/devops|150GB,
deviceName:/dev/sdb,

It splits the single line at ], then scans through all fields to find the target ones, and prints them. You could read the result into shell variables like so, then:

read VARA VARB REST <<< $(awk -vRS="],*" -vORS=" " '/rootVolume:false/ {for (i=1; i<=NF; i++) if ($i ~ /name|deviceName/) print $i}' file)
echo $VARA
name:/var/log/devops|40GB;/home/devops|150GB,
echo $VARB
deviceName:/dev/sdb,

Answer 2

You can use the command cut something like:

cat /tmp/volume.log | cut -d, -f14 | tr -d "]["
rootVolume=false

make it a variable:
rootvolume=$(cat /tmp/volume.log | cut -d, -f14 | tr -d "][")

cat /tmp/volume.log | cut -d, -f3
deviceName:/dev/sda

cat /tmp/volume.log | cut -d, -f9
name:/var/log/devops|40GB;/home/devops|150GB

Or with grep

cat /tmp/volume.log | grep -o "rootVolume:false]]," | tr "][,"

make it a variable:
rootvolume=$(cat /tmp/volume.log | grep -o "rootVolume:false]]," | tr "][,")

cat /tmp/volume.log | grep -o "deviceName:/dev/sda"

cat /tmp/volume.log | grep -o "name:/var/log/devops|40GB;/home/devops|150GB" | tr -d "\n"

-o, --only-matching Print only the matched (non-empty) parts of a matching line, with each such part on a separate output line.

Use tr after grep to remove [], ....etc from your output.