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126 lines
3.0 KiB
Groff
126 lines
3.0 KiB
Groff
.\" This file is in the public domain, so clarified as of
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.\" 2009-05-17 by Arthur David Olson.
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.TH tzselect 8 "" "Time Zone Database"
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.SH NAME
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tzselect \- select a timezone
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.SH SYNOPSIS
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.ie \n(.g .ds - \f(CR-\fP
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.el .ds - \-
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.ds d " degrees
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.ds m " minutes
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.ds s " seconds
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.ds _ " \&
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.if t \{\
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. if \n(.g .if c \(de .if c \(fm .if c \(sd \{\
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. ds d \(de
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. ds m \(fm
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. ds s \(sd
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. ds _ \|
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. \}
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.\}
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.B tzselect
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[
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.B \*-c
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.I coord
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] [
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.B \*-n
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.I limit
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] [
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.B \*-\*-help
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] [
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.B \*-\*-version
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]
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.SH DESCRIPTION
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The
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.B tzselect
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program asks the user for information about the current location,
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and outputs the resulting timezone to standard output.
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The output is suitable as a value for the TZ environment variable.
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.PP
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All interaction with the user is done via standard input and standard error.
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.SH OPTIONS
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.TP
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.BI "\*-c " coord
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Instead of asking for continent and then country and then city,
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ask for selection from time zones whose largest cities
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are closest to the location with geographical coordinates
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.I coord.
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Use ISO 6709 notation for
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.I coord,
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that is, a latitude immediately followed by a longitude. The latitude
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and longitude should be signed integers followed by an optional
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decimal point and fraction: positive numbers represent north and east,
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negative south and west. Latitudes with two and longitudes with three
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integer digits are treated as degrees; latitudes with four or six and
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longitudes with five or seven integer digits are treated as
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.I "DDMM, DDDMM, DDMMSS,"
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or
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.I DDDMMSS
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representing
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.I DD
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or
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.I DDD
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degrees,
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.I MM
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minutes,
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and zero or
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.I SS
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seconds, with any trailing fractions represent fractional minutes or
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(if
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.I SS
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is present) seconds. The decimal point is that of the current locale.
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For example, in the (default) C locale,
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.B "\*-c\ +40.689\*-074.045"
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specifies 40.689\*d\*_N, 74.045\*d\*_W,
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.B "\*-c\ +4041.4\*-07402.7"
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specifies 40\*d\*_41.4\*m\*_N, 74\*d\*_2.7\*m\*_W, and
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.B "\*-c\ +404121\*-0740240"
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specifies 40\*d\*_41\*m\*_21\*s\*_N, 74\*d\*_2\*m\*_40\*s\*_W.
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If
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.I coord
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is not one of the documented forms, the resulting behavior is unspecified.
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.TP
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.BI "\*-n " limit
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When
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.B \*-c
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is used, display the closest
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.I limit
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locations (default 10).
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.TP
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.B "\*-\*-help"
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Output help information and exit.
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.TP
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.B "\*-\*-version"
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Output version information and exit.
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.SH "ENVIRONMENT VARIABLES"
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.TP
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\f3AWK\fP
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Name of a POSIX-compliant
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.B awk
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program (default:
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.BR awk ).
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.TP
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\f3TZDIR\fP
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Name of the directory containing timezone data files (default:
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.BR /usr/share/zoneinfo ).
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.SH FILES
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.TP
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\f2TZDIR\fP\f3/iso3166.tab\fP
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Table of ISO 3166 2-letter country codes and country names.
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.TP
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\f2TZDIR\fP\f3/zone1970.tab\fP
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Table of country codes, latitude and longitude, timezones, and
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descriptive comments.
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.TP
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\f2TZDIR\fP\f3/\fP\f2TZ\fP
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Timezone data file for timezone \f2TZ\fP.
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.SH "EXIT STATUS"
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The exit status is zero if a timezone was successfully obtained from the user,
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nonzero otherwise.
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.SH "SEE ALSO"
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newctime(3), tzfile(5), zdump(8), zic(8)
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.SH NOTES
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Applications should not assume that
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.BR tzselect 's
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output matches the user's political preferences.
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