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Top Forums Shell Programming and Scripting cannot properly employ "or" operator in an if statement (bash) Post 302444803 by agama on Thursday 12th of August 2010 10:50:27 PM
Old 08-12-2010
Your original if statement was nearly correct. There must be a complete expression on either side of the or:

Code:
if [[ $sername == *DIFF*FA* || $sername ==  *DTI*FA* ]]

Your second attempt isn't working because

Code:
[ expression ]

is very much different than
Code:
[[ expression ]]

The double bracket expression is interpreted by the shell and the right hand side is treated as a pattern (if not quoted). Single brackets are treated just like any any other command (remember that [ is a link to the test command). If wildcards (* and ?) are used inside of single brackets, they are expanded as file names in the current directory and NOT treated as patterns. The filename expansion is then passed to the test command.

In my opinion it is best to avoid using single brackets in if and while statements in Kshell and bash. Forking to the test command is very inefficient not to mention the enhancements to the expressions that Kshell and bash provide.
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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