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 correspond-
       ing 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 corresponding 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 POSIX.1-2008, 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
", <name>, <value>

       if name is set, and:

	   "export %s
", <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. If a variable assignment precedes the command name of export but that variable is
       not also listed as an operand of export, then that variable shall be set in the current shell execution environment after the completion of
       the export command, but it is unspecified whether that variable is marked for export.

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 S

       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-file
	   unset 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 imple-
       mentations. 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

       Section 2.14, Special Built-In Utilities

       The Base Definitions volume of POSIX.1-2008, Section 12.2, Utility Syntax Guidelines

COPYRIGHT

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2013 Edition, Standard for Information Technol-
       ogy -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, Copyright (C)  2013  by	the  Institute	of
       Electrical and Electronics Engineers, Inc and The Open Group.  (This is POSIX.1-2008 with the 2013 Technical Corrigendum 1 applied.) 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 Stan-
       dard is the referee document. The original Standard can be obtained online at http://www.unix.org/online.html .

       Any typographical or formatting errors that appear in this page are most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors, see https://www.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE
/The Open Group						       2013								EXPORT(1P)