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EXPORT(1P)                 POSIX Programmer's Manual                EXPORT(1P)

PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux
       implementation of this interface may differ (consult the  corresponding
       Linux  manual page for details of Linux behavior), or the interface may
       not be implemented on Linux.

NAME
       export - set the export attribute for variables

SYNOPSIS
       export name[=word]...

       export -p

DESCRIPTION
       The shell shall give the export attribute to the variables  correspond-
       ing  to  the specified names, which shall cause them to be in the envi-
       ronment of subsequently executed commands. If the name of a variable is
       followed  by  =  word,  then the value of that variable shall be set to
       word.

       The export special built-in shall support the Base  Definitions  volume
       of IEEE Std 1003.1-2001, Section 12.2, Utility Syntax Guidelines.

       When  -p  is  specified,  export shall write to the standard output the
       names and values of all exported variables, in the following format:

              "export %s=%s\n", <name>, <value>

       if name is set, and:

              "export %s\n", <name>

       if name is unset.

       The shell shall format the output, including the proper use of quoting,
       so  that  it  is  suitable  for  reinput  to the shell as commands that
       achieve the same exporting results, except:

        1. Read-only variables with values cannot be reset.

        2. Variables that were unset at the time they were output need not  be
           reset  to  the  unset  state if a value is assigned to the variable
           between the time the state was saved and  the  time  at  which  the
           saved output is reinput to the shell.

       When no arguments are given, the results are unspecified.

OPTIONS
       See the DESCRIPTION.

OPERANDS
       See the DESCRIPTION.

STDIN
       Not used.

INPUT FILES
       None.

ENVIRONMENT VARIABLES
       None.

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       See the DESCRIPTION.

STDERR
       The standard error shall be used only for diagnostic messages.

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       Zero.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       None.

EXAMPLES
       Export PWD and HOME variables:

              export PWD HOME

       Set and export the PATH variable:

              export PATH=/local/bin:$PATH

       Save and restore all exported variables:

              export -p > temp-fileunset a lot of variables... processing. temp-file

RATIONALE
       Some  historical  shells  use  the  no-argument  case as the functional
       equivalent of what is required here with  -p.  This  feature  was  left
       unspecified  because  it  is not historical practice in all shells, and
       some scripts may rely on the now-unspecified results on their implemen-
       tations.  Attempts  to  specify  the -p output as the default case were
       unsuccessful in achieving consensus. The -p option was added  to  allow
       portable access to the values that can be saved and then later restored
       using; for example, a dot script.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Special Built-In Utilities

COPYRIGHT
       Portions of this text are reprinted and reproduced in  electronic  form
       from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
       -- Portable Operating System Interface (POSIX),  The  Open  Group  Base
       Specifications  Issue  6,  Copyright  (C) 2001-2003 by the Institute of
       Electrical and Electronics Engineers, Inc and The Open  Group.  In  the
       event of any discrepancy between this version and the original IEEE and
       The Open Group Standard, the original IEEE and The Open Group  Standard
       is  the  referee document. The original Standard can be obtained online
       at http://www.opengroup.org/unix/online.html .

IEEE/The Open Group                  2003                           EXPORT(1P)
 

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