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Full Discussion: diffrence in executing a shell script
Top Forums Shell Programming and Scripting diffrence in executing a shell script Post 302362974 by Scott on Monday 19th of October 2009 04:25:25 AM
Old 10-19-2009
There is no difference in how any of these are executed in that they all fork new shells.

Code:
cat Test
echo $$


echo $$; ./Test
13426784
12693590

The first one will run the script using sh, overriding what the shebang (1st line of your script says (i.e. #!/usr/bin/ksh)).

Code:
cat Test
#!/usr/bin/ksh
pushd

./Test
./Test[2]: pushd:  not found.

> bash ./Test
./Test: line 2: pushd: no other directory

It will run the script whether it's executable or not.

The second one will run the script from the current directory (./script.sh), overriding any other script.sh which is in the path.

The last one will run the first script.sh it finds in the path, not the current directory.

Code:
> ls -l Test
-rwx------    2 me     mygroup             21 Oct 19 10:15 T

> Test
ksh: Test: not found.

> PATH=.:$PATH

> Test
./Test[2]: pushd:  not found.

You missed one:

Code:
. ./script.sh

This will run script.sh in the current shell:
Code:
> cat Test
echo $$

> echo $$; . ./Test
13426784
13426784

 

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LEARN ABOUT DEBIAN

test::inline::content

Test::Inline::Content(3pm)				User Contributed Perl Documentation				Test::Inline::Content(3pm)

NAME

       Test::Inline::Content - Test::Inline 2 Content Handlers

DESCRIPTION

       One problem with the initial versions of Test::Inline 2 was the method by which it generated the script contents.

       "Test::Inline::Content" provides a basic API by which more sophisticated extensions can be written to control the content of the generated
       scripts.

METHODS

   new
       A default implementation of the "new" method is provided that takes no parameters and creates a default (empty) object.

       Returns a new "Test::Inline::Content" object.

   process $Inline $Script
       The "process" method does the work of generating the script content. It takes as argument the parent Test::Inline object, and the completed
       Test::Inline::Script object for which the file is to be generated.

       The default implementation returns only an empty script that dies with an appropriate error message.

       Returns the content of the script as a string, or "undef" on error.

SUPPORT

       See the main SUPPORT section.

AUTHOR

       Adam Kennedy <adamk@cpan.org>, <http://ali.as/>

COPYRIGHT

       Copyright 2004 - 2010 Adam Kennedy.

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

       The full text of the license can be found in the LICENSE file included with this module.

perl v5.12.4							    2010-11-22						Test::Inline::Content(3pm)

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