environ.5 (2010 09)

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environ(5) environ(5)
hh[:mm[:ss
]]
Hour (hh) is any value from 0 through 23. The optional minutes (mm) and
seconds (ss) fields are a value from 0 through 59. The hour field is required. If
offset is preceded by a
-
, the time zone is east of the Prime Meridian. A +
preceding offset indicates that the time zone is west of the Prime Meridian. The
default case is west of the Prime Meridian.
rule rule indicates when to change to and from summer (daylight-savings) time.
The rule has the form :
date
/time,date/time
where the first date
/time specifies when to change from standard to summer
time, and the second date /time specifies when to change back. The time field
is expressed in current local time.
The form of date should be one of the following :
Jn Julian day n (1 through 365). Leap days are not counted. Febru-
ary 29 cannot be referenced.
n The zero-based Julian day (0 through 365). Leap days are
counted. February 29 can be referenced.
Mm
.n.d The d day (0 through 6) of week n (1 through 5) of month m (1
through 12) of the year. Week 5 refers to the last day d of month
m. Week 1 is the week in which the first day of the month falls.
Day 0 is Sunday.
time Time has the same format as offset except that no leading sign (
-
or +) is allowed. The default, if time is not given, is 02:00:00.
While the STD field and the offset field for STD must be specified, if the DST
field is also provided, the system will supply default values for other fields not
specified. These default values come from file
/usr/lib/tztab
(see
tztab (4)), and, in general, reflect the various historical dates for start and end
of summer time.
Additional names may be placed in the environment by the export command and name
=value arguments
in sh(1), or by exec (2). It is unwise to add names that conflict with the following shell variables fre-
quently exported by
.profile files: MAIL, PS1, PS2 and IFS.
The environment of a process is accessible from C by using the global variable:
#include <unistd.h>
extern char **environ;
which points to an array of pointers to the strings that comprise the environment. The array is ter-
minated by a null pointer.
Notes
Coordinated Universal Time (UTC) is equivalent to Greenwich Mean Time (GMT).
EXTERNAL INFLUENCES
International Code Set Support
The
LANG, LC_ALL, LC_COLLATE, LC_CTYPE, LC_MESSAGES, LC_MONETARY, LC_NUMERIC,
LC_TIME, and NLSPATH environment variables provide support for internationalized applications. The
standard utilities make use of these environment variables as described here and in the individual
Environment Variables subsection of the utilities.
If these variables specify locale categories that are not based upon the same underlying codeset, the
results are unspecified, and the behavior of regular expressions APIs’, such as,
regcomp, glob, and
fnmatch may be affected.
WARNINGS
Some HP-UX commands and library routines do not use the
LANG, LC_COLLATE, LC_CTYPE,
LC_MONETARY, LC_NUMERIC, LC_TIME,orLANGOPTS environment variables. Some commands do
not use message catalogs, so NLSPATH does not affect their behavior. See the EXTERNAL INFLU-
ENCES section of specific commands and library routines for implementation details.
4 Hewlett-Packard Company − 4 − HP-UX 11i Version 3: September 2010