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jello:tldr:33ed9
This command uses the cat
and jello
commands in combination to manipulate a JSON file.
Let's break it down step by step:
-
cat ${file-json}
reads the content of the JSON file specified by the variable${file-json}
and outputs it to the standard output. -
|
is a pipe character, which allows the output of one command (in this casecat
) to be used as the input for the next command (in this casejello
). -
jello
is a command-line tool used for JSON manipulation. It takes the input JSON from the standard input and applies transformations based on a provided JSON template. -
'{...}'
is the JSON template provided tojello
. It specifies how to transform or manipulate the input JSON. -
"${my_new_key}": _.${key_name}
specifies a new key-value pair in the resulting JSON. The value is obtained from the input JSON using the_.
notation followed by the value of${key_name}
. The key is assigned the value of${my_new_key}
. -
"${my_other_key}": _.${other_key_name}
specifies another new key-value pair in the resulting JSON. Similar to the previous step, it retrieves the value from the input JSON using the_.
notation.
In summary, this command reads the content of a JSON file, then uses jello
to apply a transformation by specifying a JSON template. The template adds or modifies key-value pairs in the output JSON based on values from the input JSON and the provided variables.