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environ(7)

en...n(7)Standards, Environments, Macros, Character Sets, and miscellaneyn...n(7)

NAME
       environ - user environment

DESCRIPTION
       When  a  process  begins execution, one of the exec family of functions
       makes available  an  array  of  strings  called  the  environment;  see
       exec(2). By convention, these strings have the form variable=value, for
       example,  PATH=/sbin:/usr/sbin. These environmental variables provide a
       way to make information about a program's environment available to pro‐
       grams.


       A name can be placed in the  environment  by  the  export  command  and
       name=value  arguments  in sh(1), or by one of the exec functions. It is
       unwise to conflict with certain shell variables such as MAIL, PS1, PS2,
       and IFS that are frequently exported by .profile files; see profile(5).


       The following environmental variables can be used by  applications  and
       are expected to be set in the target runtime environment.

       HOME

           The  name  of  the user's login directory, set by login(1) from the
           password file; see passwd(5).


       LANG

           The string used to specify  internationalization  information  that
           allows  users to work with different national conventions. The set‐
           locale(3C) function checks the LANG environment variable when it is
           called with "" as the locale argument. LANG is used as the  default
           locale  if  the corresponding environment variable for a particular
           category is unset or null. If, however, LC_ALL is set to  a  valid,
           non-empty  value,  its  contents are used to override both the LANG
           and the other LC_* variables. For example, when invoked  as  setlo‐
           cale(LC_CTYPE,  ""),  setlocale()  queries the LC_CTYPE environment
           variable first to see if it is set and non-null. If LC_CTYPE is not
           set or null, then setlocale() checks the LANG environment  variable
           to see if it is set and non-null. If both LANG and LC_CTYPE are un‐
           set or NULL, the default C locale is used to set the LC_CTYPE cate‐
           gory.

           Most  commands invoke setlocale(LC_ALL, "") prior to any other pro‐
           cessing. This allows the command to be used with different national
           conventions by setting the appropriate environment variables.

           The following environment variables correspond to each category  of
           setlocale(3C):

           LC_ALL

               If  set to a valid, non-empty string value, override the values
               of LANG and all the other LC_* variables.


           LC_COLLATE

               This category specifies the character collation sequence  being
               used.  The information corresponding to this category is stored
               in a database created by the localedef(1) command.  This  envi‐
               ronment variable affects strcoll(3C) and strxfrm(3C).


           LC_CTYPE

               This  category  specifies  character  classification, character
               conversion, and widths of multibyte characters.  When  LC_CTYPE
               is  set  to  a valid value, the calling utility can display and
               handle text and file names containing valid characters for that
               locale; Extended UNIX Code (EUC) characters where any  individ‐
               ual  character can be 1, 2, or 3 bytes wide; and EUC characters
               of 1, 2, or 3 column widths. The default C  locale  corresponds
               to  the  7-bit  ASCII  character  set; only characters from ISO
               8859-1 are valid. The information corresponding to  this  cate‐
               gory  is  stored  in a database created by the localedef() com‐
               mand.  This  environment  variable  is   used   by   ctype(3C),
               mblen(3C), and many commands, such as cat(1), ed(1), ls(1), and
               vi(1).


           LC_MESSAGES

               This  category  specifies  the language of the message database
               being used. For example, an application can  have  one  message
               database with French messages, and another database with German
               messages.  Message  databases are created by the mkmsgs(1) com‐
               mand. This environment variable is used by exstr(1), gettxt(1),
               gettxt(3C), and gettext(3C).


           LC_MONETARY

               This category specifies the  monetary  symbols  and  delimiters
               used  for a particular locale. The information corresponding to
               this category is stored  in  a  database  created  by  the  lo‐
               caledef(1)  command.  This  environment variable is used by lo‐
               caleconv(3C).


           LC_NUMERIC

               This category specifies the decimal and  thousands  delimiters.
               The  information  corresponding to this category is stored in a
               database created by the localedef() command. The default C  lo‐
               cale  corresponds  to "." as the decimal delimiter and no thou‐
               sands delimiter. This environment variable is used  by  locale‐
               conv(3C), printf(3C), and strtod(3C).


           LC_TIME

               This  category specifies date and time formats. The information
               corresponding to this category is stored in a  database  speci‐
               fied  in  localedef(). The default C locale corresponds to U.S.
               date and time formats. This environment  variable  is  used  by
               many  commands  and functions; for example: at(1), calendar(1),
               date(1), strftime(3C), and getdate(3C).



       MSGVERB

           Controls which standard format message  components  fmtmsg  selects
           when   messages   are   displayed  to  stderr;  see  fmtmsg(1)  and
           fmtmsg(3C).


       NETPATH

           A colon-separated list of network identifiers. A network identifier
           is a character string used by the Network  Selection  component  of
           the  system  to provide application-specific default network search
           paths. A network identifier must consist of non-null characters and
           must have a length of at least 1. No maximum length  is  specified.
           Network  identifiers  are normally chosen by the system administra‐
           tor. A network identifier is also the first field in any  /etc/net‐
           config  file entry. NETPATH thus provides a link into the /etc/net‐
           config file and the information about a network contained  in  that
           network's  entry. /etc/netconfig is maintained by the system admin‐
           istrator. The library routines described in  getnetpath(3C)  access
           the NETPATH environment variable.


       NLSPATH

           Contains  a sequence of templates which catopen(3C) and gettext(3C)
           use when attempting to locate message catalogs. Each template  con‐
           sists  of  an  optional  prefix, one or more substitution fields, a
           filename and an optional suffix. For example:


             NLSPATH="/system/nlslib/%N.cat"

           defines that catopen() should look for all message catalogs in  the
           directory  /system/nlslib,  where  the  catalog name should be con‐
           structed from the name parameter passed to catopen(), %N, with  the
           suffix .cat.

           Substitution  fields  consist  of a % symbol, followed by a single-
           letter keyword. The following keywords are currently defined:


           %N

               The value of the name parameter passed to catopen().


           %L

               The value of LANG or LC_MESSAGES.


           %l

               The language element from LANG or LC_MESSAGES.


           %t

               The territory element from LANG or LC_MESSAGES.


           %c

               The codeset element from LANG or LC_MESSAGES.


           %%

               A single % character.

           An empty string is substituted if the specified value is  not  cur‐
           rently  defined.  The separators "_" and "." are not included in %t
           and %c substitutions.

           Templates defined in NLSPATH are separated by colons (:). A leading
           colon or two adjacent colons (::) is equivalent to  specifying  %N.
           For example:


             NLSPATH=":%N.cat:/nlslib/%L/%N.cat"

           indicates  to  catopen() that it should look for the requested mes‐
           sage catalog in name, name.cat and /nlslib/$LANG/name.cat. For get‐
           text(), %N automatically maps to messages.

           If NLSPATH is unset or NULL, catopen() and  gettext()  call  setlo‐
           cale(3C),  which  checks  LANG and the LC_* variables to locate the
           message catalogs.

           The extended interpretation of %L in Oracle  Solaris  includes  the
           support  for  accepted  locale  name  aliases  as described in get‐
           text(1),   gettext(3C),   catopen(3C),   setlocale(3C),   and   lo‐
           cale_alias(7).

           The  elements  of the LANG or LC_MESSAGES environment variables are
           described using the catopen() function. For more  information,  see
           the catopen(3C) man page.

           NLSPATH  is normally be set up on a system wide basis (in /etc/pro‐
           file) and thus makes the location and naming conventions associated
           with message catalogs transparent to both programs and users.


       PATH

           A colon (:) separated list of directories. The  directories  speci‐
           fied  by PATH are searched, in the order given, by shells and other
           utilities, to locate executables, when such executables are  speci‐
           fied  using  just their filename, without any slash (/) characters.
           The initial PATH is set by login(1), and can  be  modified  by  the
           shell,  or  other programs. It is common for this to be done within
           shell startup files. For more detail, see  the  man  page  for  the
           shell in use and exec(2).


       SEV_LEVEL

           Define severity levels and associate and print strings with them in
           standard format error messages; see addseverity(3C), fmtmsg(1), and
           fmtmsg(3C).


       TERM

           The  kind  of terminal for which output is to be prepared. This in‐
           formation is used by commands, such as  vi(1),  which  can  exploit
           special capabilities of that terminal. See the term(7) man page for
           terminal naming conventions used with this variable.


       TZ

           Time  zone  information.  The contents of this environment variable
           are used by the functions ctime(3C),  localtime(3C),  strftime(3C),
           and mktime(3C) to override the default time zone.

           By  default, this variable is not set. When not set, the system de‐
           fault time zone of localtime is used. The data for this  time  zone
           can be set by either of the commands:


             zic -l timezone

           or


             nlsadmin set-timezone timezone

           When  run, those commands will update the time zone of all programs
           relying on the localtime time zone. For more information, see tzre‐
           load(8).

           If set, the value of TZ has one of the two formats (spaces inserted
           for clarity):


             :characters

           or


             std offset dst offset, rule

           If TZ is of the first format (that is, if the first character is  a
           colon  (:)),  or  if TZ is not of the second format, then TZ desig‐
           nates  a  path  to  a  time  zone   database   file   relative   to
           /usr/share/lib/zoneinfo/, ignoring a leading colon if one exists.

           Otherwise, TZ is of the second form, which when expanded is as fol‐
           lows:

             stdoffset[dst[offset][,start[/time],end[/time]]]


           std and dst

               Indicate  no less than three, nor more than {TZNAME_MAX}, bytes
               that are the designation for the standard (std) or the alterna‐
               tive (dst, such as Daylight Saving Time) time zone. Only std is
               required; if dst is missing, then the alternative time does not
               apply in this time zone. Each of these fields can occur in  ei‐
               ther of two formats, quoted or unquoted:


                   o      In the quoted form, the first character is the less-
                          than  ('<')  character and the last character is the
                          greater-than ('>') character. All characters between
                          these quoting characters are alphanumeric characters
                          from the portable character set in the  current  lo‐
                          cale,  the  plus-sign ('+') character, or the minus-
                          sign ('-') character. The std and dst fields in this
                          case do not include the quoting characters.


                   o      In the unquoted form, all characters in these fields
                          are alphabetic characters from the portable  charac‐
                          ter set in the current locale.

               The  interpretation  of  these  fields is unspecified if either
               field is less than three bytes (except for the case when dst is
               missing), more than {TZNAME_MAX}  bytes,  or  if  they  contain
               characters other than those specified.


           offset

               Indicate  the value one must add to the local time to arrive at
               Coordinated Universal Time. The offset has the form:


                 hh[:mm[:ss]]

               The minutes (mm) and seconds (ss) are optional. The  hour  (hh)
               is required and can be a single digit. The offset following std
               is required. If no offset follows dst, daylight savings time is
               assumed to be one hour ahead of standard time. One or more dig‐
               its  can  be used. The value is always interpreted as a decimal
               number. The hour must be between 0 and 24, and the minutes (and
               seconds), if present, must be between 0 and 59.  Out  of  range
               values  can  cause  unpredictable behavior. If preceded by a -,
               the time zone is east of the Prime Meridian. Otherwise,  it  is
               west  of  the  Prime Meridian (which can be indicated by an op‐
               tional preceding "+" sign).


           start/time,end/time

               Indicate when to change to and back from daylight savings time,
               where start/time describes when the change from  standard  time
               to  daylight  savings  time occurs, and end/time describes when
               the change back occurs. Each time field describes when, in cur‐
               rent local time, the change is made.

               The formats of start and end are one of the following:


               Jn

                   The Julian day n (1 ≤ n ≤ 365). Leap days are not  counted.
                   That is, in all years, February 28 is day 59 and March 1 is
                   day  60. It is impossible to refer to the occasional Febru‐
                   ary 29.


               n

                   The zero-based Julian day (0 ≤ n  ≤  365).  Leap  days  are
                   counted, and it is possible to refer to February 29.


               Mm.n.d

                   The  d^th day, (0 ≤ d ≤ 6) of week n of month m of the year
                   (1 ≤ n ≤ 5, 1 ≤ m ≤ 12), where week 5 means "the last d-day
                   in month m" which can occur in either  the  fourth  or  the
                   fifth week). Week 1 is the first week in which the d^th day
                   occurs. Day zero is Sunday.

               Implementation  specific defaults are used for start and end if
               these optional fields are not specified.

               The time has the same format as offset except that  no  leading
               sign ("−" or "+") is allowed. If time is not specified, the de‐
               fault value is 02:00:00.



SEE ALSO
       cat(1),  date(1),  ed(1),  fmtmsg(1),  localedef(1),  login(1),  ls(1),
       mkmsgs(1), nice(1), nohup(1), sh(1), sort(1), time(1), vi(1),  exec(2),
       addseverity(3C),  catopen(3C),  ctime(3C),  ctype(3C), fmtmsg(3C), get‐
       date(3C),  getnetpath(3C),  gettext(3C),  gettxt(3C),   localeconv(3C),
       mblen(3C),  mktime(3C),  printf(3C),  setlocale(3C), strcoll(3C), strf‐
       time(3C), strtod(3C), strxfrm(3C), netconfig(5), passwd(5), profile(5),
       locale_alias(7), term(7), nlsadm(8), tzreload(8), zic(8)

WARNINGS
       The use of a null path name or dot (.) in the shell parameter  PATH  is
       strongly discouraged.

Oracle Solaris 11.4               12 Sep 2023                        en...n(7)
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