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Full Discussion: How to clear $1 when dot-running a script.
Top Forums Shell Programming and Scripting How to clear $1 when dot-running a script. Post 302173600 by fpmurphy on Friday 7th of March 2008 06:45:01 AM
Old 03-07-2008
Good, Bakunin, we agree that the variable "1" is not set by the "echo 1=$1" statement.

You claim that $1 (first positional paramater) should be available in your current environment upon sourcing a file such as in the example provided

Sorry, again, I must disagree. Positional parameters are initially assigned when you invoke a shell, temporarily replaced when a shell function is invoked, and can only be reassigned with the set special built-in command.

$1 is available within the testme script but not outside it. To illustrate this point, try the
following:
Code:
#!/usr/bin/ksh
echo "Positional Parameter 1=$1"
. ./testme XXX
echo "Positional Parameter 1=$1"

which gives the following output
Code:
$ ./demo FPM
Positional Parameter 1=FPM
1=XXX
Positional Parameter 1=FPM
$

Have you a counter example to disprove my assertion?
 

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LEARN ABOUT POSIX

shift

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

       shift -- shift positional parameters

SYNOPSIS

       shift [n]

DESCRIPTION

       The positional parameters shall be shifted. Positional parameter 1 shall be assigned the value of parameter (1+n),  parameter  2  shall	be
       assigned  the  value of parameter (2+n), and so on. The parameters represented by the numbers "$#" down to "$#-n+1" shall be unset, and the
       parameter '#' is updated to reflect the new number of positional parameters.

       The value n shall be an unsigned decimal integer less than or equal to the value of the special parameter '#'.  If n is not given, it shall
       be assumed to be 1. If n is 0, the positional and special parameters are not changed.

OPTIONS

       None.

OPERANDS

       See the DESCRIPTION.

STDIN

       Not used.

INPUT FILES

       None.

ENVIRONMENT VARIABLES

       None.

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

       If  the	n  operand  is invalid or is greater than "$#", this may be considered a syntax error and a non-interactive shell may exit; if the
       shell does not exit in this case, a non-zero exit status shall be returned. Otherwise, zero shall be returned.

CONSEQUENCES OF ERRORS

       Default.

       The following sections are informative.

APPLICATION USAGE

       None.

EXAMPLES

       $ set a b c d e
       $ shift 2
       $ echo $*
       c d e

RATIONALE

       None.

FUTURE DIRECTIONS

       None.

SEE ALSO

       Section 2.14, Special Built-In Utilities

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								 SHIFT(1P)
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