Evaluate

Evaluates the given expression against each yaml document in each file, in sequence

Usage:

yq eval [expression] [yaml_file1]... [flags]

Aliases: eval, e

Note that you can pass in - as a filename to pipe from STDIN.

Examples:

# runs the expression against each file, in series
yq e '.a.b | length' f1.yml f2.yml
# '-' will pipe from STDIN
cat file.yml | yq e '.a.b' f1.yml - f2.yml
# prints out the file
yq e sample.yaml
cat sample.yml | yq e
# prints a new yaml document
yq e -n '.a.b.c = "cat"'
# updates file.yaml directly
yq e '.a.b = "cool"' -i file.yaml

Flags:

-h, --help help for eval
-C, --colors force print with colors
-e, --exit-status set exit status if there are no matches or null or false is returned
-I, --indent int sets indent level for output (default 2)
-i, --inplace update the yaml file inplace of first yaml file given.
-M, --no-colors force print with no colors
-N, --no-doc Don't print document separators (---)
-n, --null-input Don't read input, simply evaluate the expression given. Useful for creating yaml docs from scratch.
-j, --tojson output as json. Set indent to 0 to print json in one line.
-v, --verbose verbose mode