EXPORT - Online Linux Manual PageSection : 1P
Updated : 2017
Source : IEEE/The Open Group
Note : POSIX Programmer's Manual
PROLOGThis 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.
NAMEexport — set the export attribute for variables
SYNOPSISexport name[=word]... export -p
DESCRIPTIONThe shell shall give the export attribute to the variables corresponding to the specified names, which shall cause them to be in the environment 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.1‐2017, 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.
OPTIONSSee the DESCRIPTION.
OPERANDSSee the DESCRIPTION.
STDINNot used.
INPUT FILESNone.
ENVIRONMENT VARIABLESNone.
ASYNCHRONOUS EVENTSDefault.
STDOUTSee the DESCRIPTION.
STDERR SThe standard error shall be used only for diagnostic messages.
OUTPUT FILESNone.
EXTENDED DESCRIPTIONNone.
EXIT STATUS 0 All name operands were successfully exported. >0 At least one name could not be exported, or the −p option was specified and an error occurred.
CONSEQUENCES OF ERRORSDefault. The following sections are informative.
APPLICATION USAGENote that, unless X was previously marked readonly, the value of "$?" after: export X=$(false)will be 0 (because export successfully set X to the empty string) and that execution continues, even if set −e is in effect. In order to detect command substitution failures, a user must separate the assignment from the export, as in: X=$(false) export X
EXAMPLESExport PWD and HOME variables: export PWD HOMESet and export the PATH variable: export PATH=/local/bin:$PATHSave and restore all exported variables: export -p > temp-file unset a lot of variables ​... processing ​. temp-file
RATIONALESome 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 implementations. 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 DIRECTIONSNone.
SEE ALSOSection 2.14, Special Built-In Utilities The Base Definitions volume of POSIX.1‐2017, Section 12.2, Utility Syntax Guidelines
COPYRIGHTPortions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 7, 2018 Edition, Copyright (C) 2018 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 . 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 . 0
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