CODEWITHSUNDEEP
arraysjsonbashshelljq
Somnath Pathak
Somnath Pathak

Reputation: 171

Create JSON of environment variables name-value pairs from array of environment variable names with jq in bash script

Requirement:

In a BASH script,

...iterate over an array of environment variable names as shown below:

arr = ('env_var1' 'env_var2' 'env_var3')

and, using jq generate a JSON of environment variable name-value pairs like below:

{
 "env_var1": "env_var1_value_is_1",
 "env_var2": "env_var2_value_is_2",
 "env_var3": "env_var3_value_is_3"
}

Current approach: Using this stackoverflow question's solution as a reference

printf '%s\n' "${arr[@]}" |
  xargs -L 1 -I {} jq -sR --arg key {} '{ ($key): . }' | jq -s 'add'

where arr array contains the environment variable names for which I want the values, however I am unable to interpolate the ${environment_variable_name} into the JSON's value in each key-value pair

Upvotes: 3

Views: 1086

Answers (2)

peak
peak

Reputation: 116957

Since by assumption the variables referenced in arr are environment variables, you could use printf along the lines of your attempt as follows:

printf '%s\n' "${arr[@]}" | jq -nR '[inputs | {(.): env[.] }] | add'

This also works with gojq and fq, and might be useful if your jq does not support $ARGS

Upvotes: 2

hobbs
hobbs

Reputation: 240531

How about

jq -n '$ARGS.positional | map({ (.): env[.] }) | add' --args "${arr[@]}"

Using $ARGS.positional with --args avoids the need to execute jq once per item in the array, and the env builtin is the thing you needed to pull values out of the environment.

Upvotes: 3

Related Questions