$ gem install xvert

$ xvert help
Commands:
  xvert --version, -v   # Print Xvert version
  xvert help [COMMAND]  # Describe available commands or one specific command
  xvert jj              # Convert JSON to JSON
  xvert jt              # Convert JSON to TOML
  xvert jx              # Convert JSON to XML
  xvert jy              # Convert JSON to YAML
  xvert tj              # Convert TOML to JSON
  xvert tt              # Convert TOML to TOML
  xvert tx              # Convert TOML to XML
  xvert ty              # Convert TOML to YAML
  xvert xj              # Convert XML to JSON
  xvert xt              # Convert XML to TOML
  xvert xx              # Convert XML to XML
  xvert xy              # Convert XML to YAML
  xvert yj              # Convert YAML to JSON
  xvert yt              # Convert YAML to TOML
  xvert yx              # Convert YAML to XML
  xvert yy              # Convert YAML to YAML

$ xvert jj < foo.json

$ xvert jt < foo.json

$ xvert jx < foo.json

$ xvert jy < foo.json

$ xvert tj < foo.toml

$ xvert tt < foo.toml

$ xvert tx < foo.toml

$ xvert ty < foo.toml

$ xvert xj < foo.xml

$ xvert xt < foo.xml

$ xvert xx < foo.xml

$ xvert xy < foo.xml

$ xvert yj < foo.yaml

$ xvert yt < foo.yaml

$ xvert yx < foo.yaml

$ xvert yy < foo.yaml