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



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

NAME
       dot - execute commands in the current environment

SYNOPSIS
       . file

DESCRIPTION
       The shell shall execute commands from the file in the current environment.

       If  file  does not contain a slash, the shell shall use the search path specified by PATH to find the directory
       containing file. Unlike normal command search, however, the file searched for by the dot utility  need  not  be
       executable. If no readable file is found, a non-interactive shell shall abort; an interactive shell shall write
       a diagnostic message to standard error, but this condition shall not be considered a syntax error.

OPTIONS
       None.

OPERANDS
       See the DESCRIPTION.

STDIN
       Not used.

INPUT FILES
       See the DESCRIPTION.

ENVIRONMENT VARIABLES
       See the DESCRIPTION.

ASYNCHRONOUS EVENTS
       Default.

STDOUT
       Not used.

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

OUTPUT FILES
       None.

EXTENDED DESCRIPTION
       None.

EXIT STATUS
       Returns the value of the last command executed, or a zero exit status if no command is executed.

CONSEQUENCES OF ERRORS
       Default.

       The following sections are informative.

APPLICATION USAGE
       None.

EXAMPLES
              cat foobar
              foo=hello bar=world. foobar
              echo $foo $bar
              hello world

RATIONALE
       Some older implementations searched the current directory for the file, even if the value  of  PATH  disallowed
       it.   This  behavior was omitted from this volume of IEEE Std 1003.1-2001 due to concerns about introducing the
       susceptibility to trojan horses that the user might be trying to avoid by leaving dot out of PATH.

       The KornShell version of dot takes optional arguments that are set to the  positional  parameters.  This  is  a
       valid extension that allows a dot script to behave identically to a function.

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, Stan-
       dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base  Specifica-
       tions  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 Stan-
       dard,  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                              DOT(1P)