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](https://stackoverflow.com/questions/24942875/change-json-file-by-bash-script) — Lenna, Nov 30 '20 at 19:35

Charles Duffy · Accepted Answer · 2020-11-30T18:59:43.093

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 '20 at 18:59

answered Nov 30 '20 at 18:48

Charles Duffy

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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 . – Shahroz Pervaz Nov 30 '20 at 18:55
I don't think your question currently specifies that constraint -- your sample data edits _both_ names. – Charles Duffy Nov 30 '20 at 18:56
...that said, does applying that edit between the line `transit_vnet {` and the next-following line with only a `}` work? – Charles Duffy Nov 30 '20 at 18:57
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 – Shahroz Pervaz Nov 30 '20 at 18:57
1

See the edit, changing `is_transit` only inside the `transit_vnet` block. – Charles Duffy Nov 30 '20 at 19:00
got it . is it possible to to change name of just `transit_vnet` block , As I am not sure if it in future name of both can be same as `dummy` – Shahroz Pervaz Nov 30 '20 at 19:08
Of course, just use the same technique shown above for `is_transit` for `name` instead. – Charles Duffy Nov 30 '20 at 19:14
`sed -r -e '/transit_vnet = [{]/,/[}]/ { s/name = dummy/name = myname/; }g' /variables.tf` doing this but not changing Name :( – Shahroz Pervaz Nov 30 '20 at 19:45
You're matching only exact `name = dummy`, there, but not with the extra spaces. – Charles Duffy Nov 30 '20 at 19:50
Still I am unable to figure out sir , can you please update your answer. – Shahroz Pervaz Nov 30 '20 at 21:24
The answer answers the question you asked. To edit it would make it answer a different question, which you did not ask. Thus, I do not intend to edit it further. – Charles Duffy Nov 30 '20 at 23:36
sir I am stuck on a small issue . need help in case of ***name*** what I will use instead of this `[{]/,/[}]/ ` – Shahroz Pervaz Dec 01 '20 at 21:06

change variable values using sed command

1 Answers1