DOT
Section: POSIX Programmer's Manual (P)
Updated: 2003
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, 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 .
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- OPERANDS
-
- STDIN
-
- INPUT FILES
-
- ENVIRONMENT VARIABLES
-
- ASYNCHRONOUS EVENTS
-
- STDOUT
-
- STDERR
-
- OUTPUT FILES
-
- EXTENDED DESCRIPTION
-
- EXIT STATUS
-
- CONSEQUENCES OF ERRORS
-
- APPLICATION USAGE
-
- EXAMPLES
-
- RATIONALE
-
- FUTURE DIRECTIONS
-
- SEE ALSO
-
- COPYRIGHT
-
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