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diff --git a/man8/zic.8 b/man8/zic.8 new file mode 100644 index 000000000..2da0eea5b --- /dev/null +++ b/man8/zic.8 @@ -0,0 +1,414 @@ +.TH ZIC 8 +.SH NAME +zic \- time zone compiler +.SH SYNOPSIS +.B zic +[ +.B \-v +] [ +.B \-d +.I directory +] [ +.B \-l +.I localtime +] [ +.B \-p +.I posixrules +] [ +.B \-L +.I leapsecondfilename +] [ +.B \-s +] [ +.B \-y +.I command +] [ +.I filename +\&... ] +.SH DESCRIPTION +.if t .ds lq `` +.if t .ds rq '' +.if n .ds lq \&"\" +.if n .ds rq \&"\" +.de q +\\$3\*(lq\\$1\*(rq\\$2 +.. +.I Zic +reads text from the file(s) named on the command line +and creates the time conversion information files specified in this input. +If a +.I filename +is +.BR \- , +the standard input is read. +.PP +These options are available: +.TP +.BI "\-d " directory +Create time conversion information files in the named directory rather than +in the standard directory named below. +.TP +.BI "\-l " timezone +Use the given time zone as local time. +.I Zic +will act as if the input contained a link line of the form +.sp +.ti +.5i +Link \fItimezone\fP localtime +.TP +.BI "\-p " timezone +Use the given time zone's rules when handling POSIX-format +time zone environment variables. +.I Zic +will act as if the input contained a link line of the form +.sp +.ti +.5i +Link \fItimezone\fP posixrules +.TP +.BI "\-L " leapsecondfilename +Read leap second information from the file with the given name. +If this option is not used, +no leap second information appears in output files. +.TP +.B \-v +Complain if a year that appears in a data file is outside the range +of years representable by +.IR time (2) +values. +.TP +.B \-s +Limit time values stored in output files to values that are the same +whether they're taken to be signed or unsigned. +You can use this option to generate SVVS-compatible files. +.TP +.BI "\-y " command +Use the given +.I command +rather than +.B yearistype +when checking year types (see below). +.PP +Input lines are made up of fields. +Fields are separated from one another by any number of white space characters. +Leading and trailing white space on input lines is ignored. +An unquoted sharp character (#) in the input introduces a comment which extends +to the end of the line the sharp character appears on. +White space characters and sharp characters may be enclosed in double quotes +(") if they're to be used as part of a field. +Any line that is blank (after comment stripping) is ignored. +Non-blank lines are expected to be of one of three types: +rule lines, zone lines, and link lines. +.PP +A rule line has the form +.nf +.ti +.5i +.ta \w'Rule\0\0'u +\w'NAME\0\0'u +\w'FROM\0\0'u +\w'1973\0\0'u +\w'TYPE\0\0'u +\w'Apr\0\0'u +\w'lastSun\0\0'u +\w'2:00\0\0'u +\w'SAVE\0\0'u +.sp +Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S +.sp +For example: +.ti +.5i +.sp +Rule US 1967 1973 \- Apr lastSun 2:00 1:00 D +.sp +.fi +The fields that make up a rule line are: +.TP "\w'LETTER/S'u" +.B NAME +Gives the (arbitrary) name of the set of rules this rule is part of. +.TP +.B FROM +Gives the first year in which the rule applies. +Any integer year can be supplied; the Gregorian calendar is assumed. +The word +.B minimum +(or an abbreviation) means the minimum year representable as an integer. +The word +.B maximum +(or an abbreviation) means the maximum year representable as an integer. +Rules can describe times that are not representable as time values, +with the unrepresentable times ignored; this allows rules to be portable +among hosts with differing time value types. +.TP +.B TO +Gives the final year in which the rule applies. +In addition to +.B minimum +and +.B maximum +(as above), +the word +.B only +(or an abbreviation) +may be used to repeat the value of the +.B FROM +field. +.TP +.B TYPE +Gives the type of year in which the rule applies. +If +.B TYPE +is +.B \- +then the rule applies in all years between +.B FROM +and +.B TO +inclusive. +If +.B TYPE +is something else, then +.I zic +executes the command +.ti +.5i +\fByearistype\fP \fIyear\fP \fItype\fP +.br +to check the type of a year: +an exit status of zero is taken to mean that the year is of the given type; +an exit status of one is taken to mean that the year is not of the given type. +.TP +.B IN +Names the month in which the rule takes effect. +Month names may be abbreviated. +.TP +.B ON +Gives the day on which the rule takes effect. +Recognized forms include: +.nf +.in +.5i +.sp +.ta \w'Sun<=25\0\0'u +5 the fifth of the month +lastSun the last Sunday in the month +lastMon the last Monday in the month +Sun>=8 first Sunday on or after the eighth +Sun<=25 last Sunday on or before the 25th +.fi +.in -.5i +.sp +Names of days of the week may be abbreviated or spelled out in full. +Note that there must be no spaces within the +.B ON +field. +.TP +.B AT +Gives the time of day at which the rule takes effect. +Recognized forms include: +.nf +.in +.5i +.sp +.ta \w'1:28:13\0\0'u +2 time in hours +2:00 time in hours and minutes +15:00 24-hour format time (for times after noon) +1:28:14 time in hours, minutes, and seconds +\- equivalent to 0 +.fi +.in -.5i +.sp +where hour 0 is midnight at the start of the day, +and hour 24 is midnight at the end of the day. +Any of these forms may be followed by the letter +.B w +if the given time is local +.q "wall clock" +time, +.B s +if the given time is local +.q standard +time, or +.B u +(or +.B g +or +.BR z ) +if the given time is universal time; +in the absence of an indicator, +wall clock time is assumed. +.TP +.B SAVE +Gives the amount of time to be added to local standard time when the rule is in +effect. +This field has the same format as the +.B AT +field +(although, of course, the +.B w +and +.B s +suffixes are not used). +.TP +.B LETTER/S +Gives the +.q "variable part" +(for example, the +.q S +or +.q D +in +.q EST +or +.q EDT ) +of time zone abbreviations to be used when this rule is in effect. +If this field is +.BR \- , +the variable part is null. +.PP +A zone line has the form +.sp +.nf +.ti +.5i +.ta \w'Zone\0\0'u +\w'Australia/Adelaide\0\0'u +\w'GMTOFF\0\0'u +\w'RULES/SAVE\0\0'u +\w'FORMAT\0\0'u +Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL] +.sp +For example: +.sp +.ti +.5i +Zone Australia/Adelaide 9:30 Aus CST 1971 Oct 31 2:00 +.sp +.fi +The fields that make up a zone line are: +.TP "\w'GMTOFF'u" +.B NAME +The name of the time zone. +This is the name used in creating the time conversion information file for the +zone. +.TP +.B GMTOFF +The amount of time to add to UTC to get standard time in this zone. +This field has the same format as the +.B AT +and +.B SAVE +fields of rule lines; +begin the field with a minus sign if time must be subtracted from UTC. +.TP +.B RULES/SAVE +The name of the rule(s) that apply in the time zone or, +alternately, an amount of time to add to local standard time. +If this field is +.B \- +then standard time always applies in the time zone. +.TP +.B FORMAT +The format for time zone abbreviations in this time zone. +The pair of characters +.B %s +is used to show where the +.q "variable part" +of the time zone abbreviation goes. +Alternately, +a slash (/) +separates standard and daylight abbreviations. +.TP +.B UNTIL +The time at which the UTC offset or the rule(s) change for a location. +It is specified as a year, a month, a day, and a time of day. +If this is specified, +the time zone information is generated from the given UTC offset +and rule change until the time specified. +The month, day, and time of day have the same format as the IN, ON, and AT +columns of a rule; trailing columns can be omitted, and default to the +earliest possible value for the missing columns. +.IP +The next line must be a +.q continuation +line; this has the same form as a zone line except that the +string +.q Zone +and the name are omitted, as the continuation line will +place information starting at the time specified as the +.B UNTIL +field in the previous line in the file used by the previous line. +Continuation lines may contain an +.B UNTIL +field, just as zone lines do, indicating that the next line is a further +continuation. +.PP +A link line has the form +.sp +.nf +.ti +.5i +.ta \w'Link\0\0'u +\w'Europe/Istanbul\0\0'u +Link LINK-FROM LINK-TO +.sp +For example: +.sp +.ti +.5i +Link Europe/Istanbul Asia/Istanbul +.sp +.fi +The +.B LINK-FROM +field should appear as the +.B NAME +field in some zone line; +the +.B LINK-TO +field is used as an alternate name for that zone. +.PP +Except for continuation lines, +lines may appear in any order in the input. +.PP +Lines in the file that describes leap seconds have the following form: +.nf +.ti +.5i +.ta \w'Leap\0\0'u +\w'YEAR\0\0'u +\w'MONTH\0\0'u +\w'DAY\0\0'u +\w'HH:MM:SS\0\0'u +\w'CORR\0\0'u +.sp +Leap YEAR MONTH DAY HH:MM:SS CORR R/S +.sp +For example: +.ti +.5i +.sp +Leap 1974 Dec 31 23:59:60 + S +.sp +.fi +The +.BR YEAR , +.BR MONTH , +.BR DAY , +and +.B HH:MM:SS +fields tell when the leap second happened. +The +.B CORR +field +should be +.q + +if a second was added +or +.q - +if a second was skipped. +.\" There's no need to document the following, since it's impossible for more +.\" than one leap second to be inserted or deleted at a time. +.\" The C Standard is in error in suggesting the possibility. +.\" See Terry J Quinn, The BIPM and the accurate measure of time, +.\" Proc IEEE 79, 7 (July 1991), 894-905. +.\" or +.\" .q ++ +.\" if two seconds were added +.\" or +.\" .q -- +.\" if two seconds were skipped. +The +.B R/S +field +should be (an abbreviation of) +.q Stationary +if the leap second time given by the other fields should be interpreted as UTC +or +(an abbreviation of) +.q Rolling +if the leap second time given by the other fields should be interpreted as +local wall clock time. +.SH NOTE +For areas with more than two types of local time, +you may need to use local standard time in the +.B AT +field of the earliest transition time's rule to ensure that +the earliest transition time recorded in the compiled file is correct. +.SH FILE +/usr/local/etc/zoneinfo standard directory used for created files +.SH "SEE ALSO" +newctime(3), tzfile(5), zdump(8) +.\" @(#)zic.8 7.19 |