Trying to use py3 or shyaml to validate a yml file.

validate-yaml-file-with-py3.sh

# Generate yaml file.
echo -e "# http://yaml.org/spec/\n---\nYAML SPEC RELEASES: DATE\n    - Release 1.0: 2004-01-29\n\
    - Release 1.1: 2004-12-30 \n    - Release 1.2: 2009-09-29\n—--" > yaml-spec-releases-and-dates.yml

cat yaml-spec-releases-and-dates.yml | shyaml -y

cat > known-good-yaml.yml <<EOF
---
invoice: 34843
date   : 2001-01-23
bill-to: &id001
    given  : Chris
    family : Dumars
    address:
        lines: |
            458 Walkman Dr.
            Suite #292
        city    : Royal Oak
        state   : MI
        postal  : 48046
ship-to: *id001
product:
    - sku         : BL394D
      quantity    : 4
      description : Basketball
      price       : 450.00
    - sku         : BL4438H
      quantity    : 1
      description : Super Hoop
      price       : 2392.00
tax  : 251.42
total: 4443.52
comments: >
    Late afternoon is best.
    Backup contact is Nancy
    Billsmer @ 338-4338.
EOF

cat known-good-yaml.yml | shyaml -y

# Alt method:  https://liquidat.wordpress.com/2016/01/21/short-tip-verify-yaml-in-shell-via-python-one-liner/