The system operator allows you to run an external command and use its output as a value in your expression.
Security warning: The system operator is disabled by default. You must explicitly pass --enable-system-operator to use it.
yq --enable-system-operator --null-input '.field = system("command"; "arg1")'The operator takes:
- A command string (required)
- An argument or array of arguments separated by
;(optional)
The current matched node's value is serialised and piped to the command via stdin. The command's stdout (with trailing newline stripped) is returned as a string.
The system operator is disabled by default. When disabled, a warning is logged and null is returned instead of running the command.
Use --enable-system-operator flag to enable it.