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System Administration Commands | zic(1M) |
SYNOPSIS
| zic [-s] [-v] [-l localtime] [-p posixrules] [-d directory] [-y yearistype] [filename ...] |
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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 filename is '-',
the standard input is read.
Input lines are made up of fields. Fields are separated by any number
of white space characters. Leading and trailing white space on input lines
is ignored. A pound sign (#) indicates a comment that
extends to the end of the line. White space characters and pound signs can
be enclosed within double quotes (" ") if they are 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, or link lines.
Rule
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A rule line has the form:
For example:
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Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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The fields that make up a rule line are:
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Rule USA 1969 1973 - Apr lastSun 2:00 1:00 D
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NAME
- Gives the (arbitrary)
name of the set of rules this rule is part of.
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FROM
- Gives the first year in which the rule applies. The word minimum (or an abbreviation) means the minimum year with a representable
time value. The word maximum (or an abbreviation) means
the maximum year with a representable time value.
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TO
- Gives the final year in which the rule applies. In addition
to minimum and maximum (as above),
the word only (or an abbreviation) can be used to repeat
the value of the FROM field.
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TYPE
- Gives the type of year in which the rule applies. If TYPE is:
- '-'
- The rule applies in all years between FROM and TO, inclusive.
-
uspres
- The
rule applies in U.S. Presidential election years.
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nonpres
- The
rule applies in years other than U.S. Presidential election years.
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even
- The rule
applies to even-numbered years.
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odd
- The rule
applies to odd-numbered years.
If TYPE is
something else, then zic will attempt to execute the
command
to check the type of a year: an exit status of 0
means that the year is of the given type; an exit status of 1
means that the year is not of the given type. The yearistype
command is not currently provided in the Solaris environment.
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IN
- Names the month in which the rule takes effect. Month names
can be abbreviated.
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ON
- Gives the day on which the rule takes effect. Recognized
forms include:
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5
- the fifth day of the month
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lastSun
- The
last Sunday in the month
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lastMon
- The
last Monday in the month
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Sun>=8
- First
Sunday on or after the eighth
-
Sun<=25
- Last Sunday on or before the 25th
Names of days of the week can be abbreviated or spelled
out in full. Note: There cannot be spaces within the ON field.
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AT
- Gives the time of day at which the rule takes effect. Recognized
forms include:
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2
- Time in hours
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2:00
- Time in
hours and minutes
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15:00
- 24-hour
format time (for times after noon)
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1:28:14
- Time
in hours, minutes, and seconds, 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 can be followed by the letter w if the given time is local "wall clock" time; s if the given time is local "standard" time; or u (or g or z) if the given
time is universal time. In the absence of an indicator, wall clock time
is assumed.
-
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 AT field (without the w
and s suffixes).
-
LETTER/S
- Gives the "variable part" (for example, the "S"
or "D" in "EST" or "EDT" of time zone
abbreviations to be used when this rule is in effect. If this field is '-', the variable part is null.
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Zone
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A zone line has the form:
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Zone NAME GMTOFF RULES/SAVE FORMAT [UNTIL]
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For example:
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Zone Australia/SouthWest 9:30 - CST 1992 Mar 15 12:00
8:30 Aus CST
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The fields that make up a zone line are:
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NAME
- The name of
the time zone. This is the name used in creating the time conversion information
file for the zone.
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GMTOFF
- The amount of time to add to UTC to get
standard time in this zone. This field has the same format as the AT and SAVE fields of rule lines; begin the
field with a minus sign to subtract time from UTC.
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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 `-', then standard time always applies in the
time zone.
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FORMAT
- The format for time zone abbreviations in this time zone.
The pair of characters %s is used to show where the "variable
part" of the time zone abbreviation goes. Alternately, a slash (/)
separates standard and daylight abbreviations.
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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. The time of day has the same format as
the AT field of rule lines. 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.
The next line must be a "continuation" line. This line
has the same form as a zone line except that the string "Zone"
and the name are omitted. The continuation line places information starting
at the time specified as the UNTIL
field in the previous line in the file used by the previous line. Continuation
lines can contain an UNTIL field,
just as zone lines do, indicating that the next line is a further continuation.
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Link
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A link line has the form:
For example:
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Link Europe/Istanbul Asia/Istanbul
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The LINK-FROM field should
appear as the NAME field in some
zone line; the LINK-TO field is
used as an alternate name for that zone.
Except for continuation lines, lines can appear in any order in the
input.
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- -d directory
- Creates
time conversion information files in the directory directory rather than in the standard directory /usr/share/lib/zoneinfo.
- -l localtime
- Uses the given time zone as local time localtime. zic acts as if the file contained a link
line of the form:
- -p posixrules
- Uses the rules of the given time zone posixrules when handling POSIX-format time zone environment variables. zic acts as if the input contained a link line of the form:
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Link posixrules posixrules
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This option is not used by ctime(3C)
and mktime(3C)
in the Solaris environment.
- -s
- Limits time
values stored in output files to values that are the same whether they are
taken to be signed or unsigned. You can use this option to generate SVVS-compatible
files.
- -v
- Complains if
a year that appears in a data file is outside the range of years representable
by system time values (0:00:00 a.m. UTC, January 1, 1970, to 3:14:07 a.m. UTC, January 19, 2038).
- -y yearistype
- Uses the given command yearistype
rather than yearistype when checking year types (see Rules under DESCRIPTION).
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-
filename
- A file containing input lines
that specify the time conversion information files to be created. If a filename is '-', the standard input
is read.
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/usr/share/lib/zoneinfo
- Standard directory
used for created files
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/usr/share/lib/zoneinfo/src
- Directory containing source files
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See attributes(5)
for descriptions of the following attributes:
ATTRIBUTE TYPE | ATTRIBUTE VALUE |
Availability | SUNWcsu |
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For areas with more than two types of local time, you might need to
use local standard time in the AT
field of the earliest transition time's rule to ensure that the earliest
transition time recorded in the compiled file is correct.
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