jq:tldr:52adf

This command is used to read the content of a JSON file and parse it using the jq command line tool, which is commonly used for manipulating JSON data.

Here is the breakdown of the command:

1. ${cat filename-json}: This part uses the cat command to fetch the content of the file named filename-json.

   • cat is a command that concatenates and displays the content of files.
   • ${} is a syntax used to embed a command within another command. In this case, it executes the cat filename-json command and provides its output as input to the next command in the pipeline.

2. |: This is a pipe symbol used to redirect the output of the previous command to the input of the next command.

   • In this case, it passes the output of cat filename-json to the next command, jq.

3. jq '.[]': This command takes the JSON input and applies the '.[]' filter using jq.

   • jq is a powerful command-line JSON processor that can be used to extract, transform, and manipulate JSON data.
   • .[] is a filter in jq that selects all the elements in an array or all the values in an object.
   • By applying this filter, jq will extract all the elements or values from the JSON data received as input.

In summary, the command reads the content of a JSON file and then uses jq to extract all the elements or values from that JSON data.