.IP "\fB\-\-color\fR[\fB=\fR\fIwhen\fR]
.
Colorize the output (for some commands); \fIwhen\fR can be \fBnever\fR,
\fBalways\fR, or \fBauto\fR (the default).
.
.RS
.PP
Only some commands support output coloring.  Color names and default
colors may change in future releases.
.PP
The environment variable \fBOVS_COLORS\fR 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
\fBac:01;31:dr=34:le=31:pm=36:pr=35:sp=33:vl=32\fR. Supported capabilities were
initially designed for coloring flows from \fBovs-ofctl dump-flows\fR
\fIswitch\fR command, and they are as follows.
.RS
.TP
\fBac=01;31\fR
SGR substring for \fBactions=\fR keyword in a flow.
The default is a bold red text foreground.
.TP
\fBdr=34\fR
SGR substring for \fBdrop\fR keyword.
The default is a dark blue text foreground.
.TP
\fBle=31\fR
SGR substring for \fBlearn=\fR keyword in a flow.
The default is a red text foreground.
.TP
\fBpm=36\fR
SGR substring for flow match attribute names.
The default is a cyan text foreground.
.TP
\fBpr=35\fR
SGR substring for keywords in a flow that are followed by arguments inside
parenthesis.
The default is a magenta text foreground.
.TP
\fBsp=33\fR
SGR substring for some special keywords in a flow, notably: \fBtable=\fR,
\fBpriority=\fR, \fBload:\fR, \fBoutput:\fR, \fBmove:\fR, \fBgroup:\fR,
\fBCONTROLLER:\fR, \fBset_field:\fR, \fBresubmit:\fR, \fBexit\fR.
The default is a yellow text foreground.
.TP
\fBvl=32\fR
SGR substring for a lone flow match attribute with no field name.
The default is a green text foreground.
.RE
.PP
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.
.RE