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Full Discussion: A little help please
Top Forums Shell Programming and Scripting A little help please Post 302145561 by immyakram on Wednesday 14th of November 2007 03:56:46 PM
Old 11-14-2007
Thing is i understand evrything to that point but then when i get onto stuff liek testing with conditions - testing charachter data, testing numeric data and testing for files. Let me give you an example if you explain this little part would be great.

Although test is most often used for decision making, it can also be used on its own as follows

$ str1=abcd
$ test $str1 = abcd
$ echo $?
0


Note: unlike the variable assignment statement in the first line in the preceding example, the test command must have the equal sign surrounded by white space.

In this example, the shell sends three arguments to test. Strings must be equivalent in both length and character by character.

$ str1="abcd "
$ test "$str1" = abcd
$ echo
$?
1
 
ATF-SH(1)						    BSD General Commands Manual 						 ATF-SH(1)

NAME
atf-sh [-s shell] -- interpreter for shell-based test programs SYNOPSIS
atf-sh script DESCRIPTION
atf-sh is an interpreter that runs the test program given in script after loading the atf-sh(3) library. atf-sh is not a real interpreter though: it is just a wrapper around the system-wide shell defined by ATF_SHELL. atf-sh executes the inter- preter, loads the atf-sh(3) library and then runs the script. You must consider atf-sh to be a POSIX shell by default and thus should not use any non-standard extensions. The following options are available: -s shell Specifies the shell to use instead of the value provided by ATF_SHELL. ENVIRONMENT
ATF_LIBEXECDIR Overrides the builtin directory where atf-sh is located. Should not be overridden other than for testing purposes. ATF_PKGDATADIR Overrides the builtin directory where libatf-sh.subr is located. Should not be overridden other than for testing purposes. ATF_SHELL Path to the system shell to be used in the generated scripts. Scripts must not rely on this variable being set to select a specific interpreter. EXAMPLES
Scripts using atf-sh(3) should start with: #! /usr/bin/env atf-sh Alternatively, if you want to explicitly choose a shell interpreter, you cannot rely on env(1) to find atf-sh. Instead, you have to hardcode the path to atf-sh in the script and then use the -s option afterwards as a single parameter: #! /path/to/bin/atf-sh -s/bin/bash ENVIRONMENT
ATF_SHELL Path to the system shell to be used in the generated scripts. SEE ALSO
atf-sh(3) BSD
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