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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::Assertions::TestScript(3pm)			User Contributed Perl Documentation			 Test::Assertions::TestScript(3pm)

NAME
Test::Assertions::TestScript - Base for test scripts SYNOPSIS
use Test::Assertions::TestScript; use Module::To::Test qw( frobnicate ); ASSERT(frobnicate(),"Frobnicate returns true"); DESCRIPTION
Test::Assertions::TestScript provides a base for writing test scripts. It performs some common actions such as setting up the @INC path and parsing command-line options, specifically: o The lib and t/lib directories are added to @INC. o The current directory is changed to the directory the script is in. o Test script command-line options are parsed. (See "COMMAND-LINE OPTIONS") o The test set of functions from Test::Assertions are imported into your test script. Test::Assertions::TestScript makes certain assumptions about the filesystem layout of your project: o Modules that you are testing are in the lib directory of your project. o Test scripts are in the t directory. o There may also be a t/lib directory for any modules written for the test process. Test::Assertions::TestScript should be "use"d before any modules that you intend to test. OPTIONS
Options can be supplied to the import function. These should be placed after the "use" or "import". For example use Test::Assertions::TestScript( tests => 10, options => { 'b', $opt_b }) The following options are defined: tests The number of tests to pass to "plan tests" from Test::Assertions. For example to tell Test::Assertions::TestScript that the script contains 42 tests: use Test::Assertions::TestScript tests => 42; options A hashref of additional options to capture via Getopt::Long. The "options" import parameter is passed verbatim to GetOptions, so something along the following lines is required in order to capture the "-b" command line option: use Test::Assertions::TestScript( options => { 'b' => $opt_b } ); COMMAND-LINE OPTIONS A script based on Test::Assertions::TestScript will detect the following command line options. -t Shallow tracing. Traces are "print"ed and AutoImport is turned on. -T Deep tracing. Traces are "print"ed and AutoImport is turned on. --trace-module=MODULE Imports tracing into MODULE specifically. Can be specified multiple times. -s Save generated output. You will need to write the actual code to do this in your testscript, but you can inspect $Test::Assertions::TestScript::SAVE_OUTPUT to see whether this argument was given. Be aware that all other command line options will be disregarded unless the "options" import parameter is used to capture them. VERSION
$Revision: 1.18 $ AUTHOR
Colin Robertson <cpan _at_ bbc _dot_ co _dot_ uk> COPYRIGHT
(c) BBC 2005-6. This program is free software; you can redistribute it and/or modify it under the GNU GPL. See the file COPYING in this distribution, or http://www.gnu.org/licenses/gpl.txt perl v5.10.0 2006-08-10 Test::Assertions::TestScript(3pm)
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