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Top Forums UNIX for Dummies Questions & Answers Running set options from the command line and bash command Post 302542415 by Straitsfan on Wednesday 27th of July 2011 01:49:23 PM
Old 07-27-2011
Running set options from the command line and bash command

I'm reading about debugging aids in bash and have come across the set command. It says in my little book that an addition to typing

set [option]

you can also use them "on the command line when running a script..." and it lists this in a small table:


set -o option Command Line option
noexec -n
verbose -v
xtrace -x

I know how to set the options in the first column, but how are the options in the second column used? I've tried typing the name of the script followed by the option and vice versa, but only the results of the script are displayed on the screen. Can someone tell me what I'm doing wrong, or am I misunderstanding something?

The book I'm using is "Learning the bash shell" if that helps, 3rd edition, page 222 halfway down under "set options"

Also, on the following page, when illustrating how to find a bug in program, it lists the command

bash -v scriptname

when looking for the bug.

what does the command bash do exactly? I haven't encountered this command before in this context and am not sure what's going on.
 

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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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