Cut or Awk to save lines on array in bash

Question

I have a scenario that I have to put lines of a file .txt inside an array, example of file content;

 type of host
 |
 |   first host
 |   |
 |   | second host
 |   | |     
 |   | |     same ip address 
 |   | |     |
HOST_A_B=192.168.0.1

I have to put this on array in bash

    #echo $Array[0]
    HOST_A=192.168.0.1
    #echo $Array[1]
    HOST_B=192.168.0.1

and sometimes the lines don't have a second HOST like

HOST_A_B=192.168.0.1
HOST_C=192.168.0.2
HOST_DEF_G=192.168.0.3

and the echo command output should looks like,

    #echo $Array[1]
    HOST_A=192.168.0.1
    #echo $Array[2]
    HOST_B=192.168.0.1
    #echo $Array[3]
    HOST_C=192.168.0.2
    #echo $Array[4]
    HOST_DEF=192.168.0.3
    #echo $Array[5]
    HOST_G=192.168.0.3

Any idea?

Are those lines with > Array pos the actual, literal output format you want? or are they some kind of abstract description of what you want? If the latter, then please add a sample of the actual output format. Also add a small but representative sample of your actual input file. — cas
– cas, Commented Apr 29, 2022 at 2:12

Stéphane Chazelas · Accepted Answer · 2022-04-29 13:00:54Z

5

Could be something like:

readarray -t array < <(
  awk '
    match($0, /^HOST_[^=]+=/) {
      host = substr($0, 1, RLENGTH - 1)
      ip = substr($0, RLENGTH)
      n = split(host, hosts, "_")
      for (i = 2; i <= n; i++) print "HOST_"hosts[i] ip
    }' < your-file
)

On your sample, that gives:

$ typeset -p array
declare -a array=(
  [0]="HOST_A=192.168.0.1"
  [1]="HOST_B=192.168.0.1"
  [2]="HOST_C=192.168.0.2"
  [3]="HOST_DEF=192.168.0.3"
  [4]="HOST_G=192.168.0.3"
)

edited Apr 29, 2022 at 13:00

answered Apr 29, 2022 at 5:26

Stéphane Chazelas

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