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Full Discussion: Positional Parameters Arguments/Variables when using dot (.)
Top Forums UNIX for Beginners Questions & Answers Positional Parameters Arguments/Variables when using dot (.) Post 303039568 by Corona688 on Wednesday 9th of October 2019 03:02:47 PM
Old 10-09-2019
There's not a standard, "compatible" way, but there's often a way to get it:

Code:
$ cat dot1.sh

#!/bin/bash
# dot1.sh

echo "$0 1=$1 2=$2 file=$file"

set | grep dot1

. ./dot2.sh a b

$ cat dot2.sh

echo "$0 1=$1 2=$2"

set | grep "dot2"

$ ./dot1.sh 1 2

./dot1.sh 1=1 2=2 file=
BASH_SOURCE=([0]="./dot1.sh")
_='./dot1.sh 1=1 2=2 file='
./dot1.sh 1=a 2=b
BASH_SOURCE=([0]="./dot2.sh" [1]="./dot1.sh")

$ sed -i 's/bash/ksh/' dot1.sh # replace bash with ksh

./dot1.sh 1=1 2=2 file=
_='./dot1.sh 1=1 2=2 file='
        file=/home/tyler/code/sh/dot1.sh
./dot1.sh 1=a 2=b
        file=/home/tyler/code/sh/dot2.sh

$

This 'file' isn't a real variable, unfortunately, just something to be snagged from set. I think BASH_SOURCE is a real array however.
 

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LEARN ABOUT CENTOS

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

       The exit status is >0 if n>$#; otherwise, it is zero.

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

       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 Technol-
       ogy -- 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 .

IEEE
/The Open Group						       2003								 SHIFT(1P)
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