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Full Discussion: Shell script command line arguments
Top Forums Shell Programming and Scripting Shell script command line arguments Post 302481877 by radoulov on Monday 20th of December 2010 06:01:48 AM
Old 12-20-2010
Quote:
Originally Posted by Deepak Dutt
thanks for answer i am known to this and yes, it varies for different shells

i have a doubt in

though my present shell is /bin/tcsh and if i run a script with

./script_name

the output is different than

tcsh script_name

?
I believe I understand why this is happening, it's should be specific to [t]csh and I suppose documented somewhere Smilie
On some (or all?) systems (Solaris included) when you invoke a script with no shebang as ./script_name from within [t]csh the script is executed by a predefined interpreter (/usr/bin/sh on Solaris):

Code:
> uname -sr ; echo $version
SunOS 5.8
tcsh 6.11.00 (Astron) 2001-09-02 (sparc-sun-solaris) options 8b,nls,dl,al,rh,color
> cat command_arg.sh
echo '----->' `ps -p$$ -oargs=`
echo "first arg passed is $1"
echo "2nd arg passed is $2"
echo "3rd arg passed is $3"
echo "4th arg passed is $4"
echo "5th arg passed is $5"
echo "6th arg passed is $6"
echo "7th arg passed is $7"
echo "8th arg passed is $8"
echo "9th arg passed is $9"
echo "10th arg passed is $10"
echo "11th arg passed is $11"
> ./command_arg.sh 11 12 13 14 15 16 17 18 19 20 21
-----> /bin/sh ./command_arg.sh 11 12 13 14 15 16 17 18 19 20 21
first arg passed is 11
2nd arg passed is 12
3rd arg passed is 13
4th arg passed is 14
5th arg passed is 15
6th arg passed is 16
7th arg passed is 17
8th arg passed is 18
9th arg passed is 19
10th arg passed is 110
11th arg passed is 111

So given the following script:

Code:
$ cat s
ps -p$$ -oargs=

We have:

Code:
$ bash -c './s'
bash -c ./s
$ ksh -c './s'
ksh -c ./s
$ tcsh -c './s'
/bin/sh ./s
$ csh -c './s'
/bin/sh ./s

Tested on Solaris e Linux.
Last edited by radoulov; 12-21-2010 at 04:33 AM.. Reason: Modified.
 

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LEARN ABOUT CENTOS

cpanplus::shell

CPANPLUS::Shell(3)					User Contributed Perl Documentation					CPANPLUS::Shell(3)

NAME

       CPANPLUS::Shell - base class for CPANPLUS shells

SYNOPSIS

	   use CPANPLUS::Shell; 	    # load the shell indicated by your
					    # config -- defaults to
					    # CPANPLUS::Shell::Default

	   use CPANPLUS::Shell qw[Classic]  # load CPANPLUS::Shell::Classic;

	   my $ui      = CPANPLUS::Shell->new();
	   my $name    = $ui->which;	    # Find out what shell you loaded

	   $ui->shell;			    # run the ui shell

DESCRIPTION

       This module is the generic loading (and base class) for all "CPANPLUS" shells. Through this module you can load any installed "CPANPLUS"
       shell.

       Just about all the functionality is provided by the shell that you have loaded, and not by this class (which merely functions as a generic
       loading class), so please consult the documentation of your shell of choice.

BUG REPORTS

       Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>.

AUTHOR

       This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

       The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved.

       This library is free software; you may redistribute and/or modify it under the same terms as Perl itself.

SEE ALSO

       CPANPLUS::Shell::Default, CPANPLUS::Shell::Classic, cpanp

perl v5.16.3							    2013-05-20							CPANPLUS::Shell(3)
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