change variable values using sed command

Question

I have something like this in file and I want to change few values

My file data

variable "my_vnets" {
  default = {
    transit_vnet = {
      name       = "dummy"
      cidr       = "11.1.1.1.1."
      is_transit = false
    }
    spoke1_vnet = {
      name       = "dummy2"
      cidr       = "1.1.1.1.1"
      is_transit = false
    }
  }
}

expected output

variable "my_vnets" {
  default = {
    transit_vnet = {
      name       = "NewName"
      cidr       = "11.1.1.1.1."
      is_transit = true
    }
    spoke1_vnet = {
      name       = "NewName2"
      cidr       = "2.2.2.2"
      is_transit = false
    }
  }
}

I am trying something like this but no luck

sed -i "s/\"my_vnets\" { default = \"""\" }/\"my_vnets\" { default = \""NewName"\" }/g"

Does this answer your question? change json file by bash script — Lenna
– Lenna, Commented Nov 30, 2020 at 19:35

Charles Duffy · Accepted Answer · 2020-11-30 18:59:43Z

1

In general, usage of structure-unaware tools to edit structured files should be avoided. However, if there aren't any structured tools for parsing and generating this format, consider something like:

sed -r -e '/^[[:space:]]+name[[:space:]]+=/ { s/dummy/NewName/; }' \
       -e '/transit_vnet = [{]/,/[}]/       { s/is_transit = false/is_transit = true/; }'

...replacing dummy with NewName only on lines that start with name = ; and is_transit = false with is_transit = true only after a match for transit_vnet = { and before a match for }.

edited Nov 30, 2020 at 18:59

answered Nov 30, 2020 at 18:48

Charles Duffy

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12 Comments

Shahroz Pervaz Over a year ago

thanks for reply sir , there is one constraint . for example I want to change is_transit value then whole file consisting of 'is_transit' variable will be changed. thats why I need to be specific to a variable .

Charles Duffy Over a year ago

I don't think your question currently specifies that constraint -- your sample data edits both names.

Charles Duffy Over a year ago

...that said, does applying that edit between the line transit_vnet { and the next-following line with only a } work?

Shahroz Pervaz Over a year ago

I have ` default = { transit_vnet = { name = "NewName" cidr = "11.1.1.1.1." is_transit = true } spoke1_vnet = { name = "NewName2" cidr = "2.2.2.2" is_transit = false }` 2 is_transit variables . So I just want to change one of them

Charles Duffy Over a year ago

See the edit, changing is_transit only inside the transit_vnet block.

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