trice help -log gives:

...
-prefix string
        Line prefix, options: any string or 'off|none' or 'source:' followed by 0-12 spaces, 'source:' will be replaced by source value e.g., 'COM17:'. (default "source: ")
...

So, to suppress port output, use trice log -prefix off ...

If you wish formatting the port output differently check the code this way:

To look for the switch -prefix search for "prefix" in the sources. Thins brings you to:

	fsScLog.StringVar(&emitter.Prefix, "prefix", defaultPrefix, "Line prefix, options: any string or 'off|none' or 'source:' followed by 0-12 spaces, 'source:' will be replaced by source value e.g., 'COM17:'.") // flag

That tells us, that in package emitter is a visible variable named Prefix.

Searching then for Prefix brings you also to:

// setPrefix changes "source:" to e.g., "JLINK:".
func setPrefix() {
	defaultPrefix := "source:"
	if strings.HasPrefix(Prefix, defaultPrefix) {
		Prefix = receiver.Port + ":" + Prefix[len(defaultPrefix):]
	} else if Prefix == "off" || Prefix == "none" {
		Prefix = ""
	}
}

Here you can modify the code, responsible for the port output. You could also add a variable PrefixFmt string additionally to Prefix in a similar way and a CLI switch "prefixFmt" defaulting to "deb:%12s" or so and print receiver.Port into it.

In the same way you can follow the switch -hs.

-hs string
        PC timestamp for logs and logfile name, options: 'off|none|UTCmicro|zero'
        This timestamp switch generates the timestamps on the PC only (reception time), what is good enough for many cases.
        "LOCmicro" means local time with microseconds. "UTCmicro" shows timestamps in universal time. When set to "off" no PC timestamps displayed. (default "LOCmicro")

-->

// timestamp returns local time as string according var p.timeStampFormat
func (p *TriceLineComposer) timestamp() string {
	var s string
	switch p.timestampFormat {
	case "LOCmicro":
		s = time.Now().Format(time.StampMicro) + "  "
	case "UTCmicro":
		s = "UTC " + time.Now().UTC().Format(time.StampMicro) + "  "
	case "off", "none":
		s = ""
	case "zero":
		s = "2006-01-02_1504-05 "
	default:
		s = p.timestampFormat + " "
	}
	return s
}

By the way: case "zero" and default case could be buggy...

( Looking forward to your pull requests. :-)

Uh oh!

allow to format filename:line #573

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