--color[=when]
    Colorize the output (for some commands); when can be never, always, or auto (the default).

    Only some commands support output coloring. Color names and default colors may change in future releases.

    The environment variable OVS_COLORS can be used to specify user-defined colors and other attributes used to highlight various parts of the output. If set, its value is a colon-separated list of capabilities that defaults to ac:01;31:dr=34:le=31:pm=36:pr=35:sp=33:vl=32. Supported capabilities were initially designed for coloring flows from ovs-ofctl dump-flows switch command, and they are as follows.

        ac=01;31
            SGR substring for actions= keyword in a flow. The default is a bold red text foreground.

        dr=34
            SGR substring for drop keyword. The default is a dark blue text foreground.

        le=31
            SGR substring for learn= keyword in a flow. The default is a red text foreground.

        pm=36
            SGR substring for flow match attribute names. The default is a cyan text foreground.

        pr=35
            SGR substring for keywords in a flow that are followed by arguments inside parenthesis. The default is a magenta text foreground.

        sp=33
            SGR substring for some special keywords in a flow, notably: table=, priority=, load:, output:, move:, group:, CONTROLLER:, set_field:, resubmit:, exit. The default is a yellow text foreground.

        vl=32
            SGR substring for a lone flow match attribute with no field name. The default is a green text foreground.

    See the Select Graphic Rendition (SGR) section in the documentation of the text terminal that is used for permitted values and their meaning as character attributes.