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ctempd.1
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ctempd.1
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.\"
.\" Copyright (c) 2023 Matthias Schmidt
.\"
.\" Permission to use, copy, modify, and distribute this software for any
.\" purpose with or without fee is hereby granted, provided that the above
.\" copyright notice and this permission notice appear in all copies.
.\"
.\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
.\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
.\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
.\"
.Dd January 29, 2023
.Dt CTEMPD 1
.Sh NAME
.Nm ctempd
.Nd Color Temperature Changing Daemon
.Sh SYNOPSIS
.Nm ctempd
.Op Fl fhv
.Op Fl s Ar temp
.Nm ctempd
.Op Fl fv Ar temperature
.Sh DESCRIPTION
.Nm
is a small daemon to set screen temperature.
.Nm
can either set the screen's temperature once or run in the background.
.Pp
The options are as follows:
.Bl -tag -width numbernumb
.It Fl f
Do not daemonize.
If this option is specified,
.Nm
will run in the foreground and log to stderr.
.It Fl h
Show usage.
.It Fl s Ar temp
Set the screen temperature once to
.Ar temp .
.It Fl v
Be more verbose.
.El
.Pp
If no arguments are provided
.Nm
forks into the background and sets the color temperature automatically
based on the time of day.
It uses 6000 Kelvin as default temperature value.
.Sh EXIT STATUS
.Nm
normally exists with 0 or with 1 if an error occurred.
.Sh EXAMPLES
The following examples show how to use
.Nm .
.Pp
Just set the screen's color temperature once to 4500K.
.Bd -literal -offset indent
$ ctempd -s 4500
.Ed
.Pp
Run
.Nm
in the background with a default value of 6000K.
.Bd -literal -offset indent
$ ctempd 6000
.Ed
.Sh AUTHORS
.Nm
was written by
.An Matthias Schmidt Aq Mt xhr@giessen.ccc.de .
The code to change color temperature was written by Ted Unangst.