ajson:tldr:d0404

This command involves two parts: cat ${filename-json} and ajson '${$--json[?(@-path)]}'.

1. cat ${filename-json}:

   • cat is a command used to concatenate and display the content of files.
   • ${filename-json} is a variable representing the name of a file in JSON format. The ${} syntax is used to access the value of the variable.
   • So, this part reads the content of the file named ${filename-json} using cat command.

2. ajson '${$--json[?(@-path)]}':

   • ajson is a command-line tool used for processing and manipulating JSON data.
   • '${$--json[?(@-path)]}' is an argument provided to the ajson command. It is a JSONPath expression enclosed in single quotes.
     • ${$} represents the entire JSON document.
     • --json[?(@-path)] is a JSONPath filter expression. It filters the JSON properties that have a "path" field.
   • So, this part uses the ajson command to filter and display JSON properties that have a "path" field from the JSON data received from the previous cat command.

In summary, the command reads the content of a JSON file and then filters and displays only the JSON properties that have a "path" field.