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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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Test::Requires(3pm)					User Contributed Perl Documentation				       Test::Requires(3pm)

NAME
Test::Requires - Checks to see if the module can be loaded SYNOPSIS
# in your Makefile.PL use inc::Module::Install; test_requires 'Test::Requires'; # in your test use Test::More tests => 10; use Test::Requires { 'HTTP::MobileAttribute' => 0.01, # skip all if HTTP::MobileAttribute doesn't installed }; isa_ok HTTP::MobileAttribute->new, 'HTTP::MobileAttribute::NonMobile'; # or use Test::More tests => 10; use Test::Requires qw( HTTP::MobileAttribute ); isa_ok HTTP::MobileAttribute->new, 'HTTP::MobileAttribute::NonMobile'; # or use Test::More tests => 10; use Test::Requires; test_requires 'Some::Optional::Test::Required::Modules'; isa_ok HTTP::MobileAttribute->new, 'HTTP::MobileAttribute::NonMobile'; DESCRIPTION
Test::Requires checks to see if the module can be loaded. If this fails rather than failing tests this skips all tests. AUTHOR
Tokuhiro Matsuno <tokuhirom @*(#RJKLFHFSDLJF gmail.com> THANKS TO
kazuho++ # some tricky stuff miyagawa++ # original code from t/TestPlagger.pm tomyhero++ # reported issue related older test::builder SEE ALSO
"TestPlagger.pm" in t LICENSE
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself. perl v5.10.1 2010-03-27 Test::Requires(3pm)
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