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Top Forums UNIX for Dummies Questions & Answers bash: permission denied...(after it allows me?) Post 302721779 by statichazard on Thursday 25th of October 2012 07:15:12 PM
Old 10-25-2012
bash: permission denied...(after it allows me?)

I'm sure this question comes up a lot, but I'm particularly confused in this situation.

I can run my program once, just fine. However, if I try to run it again without recompiling, bash refuses to give me permission. I have a small idea why, but I don't think think I'm right.

Here's what I'm doing (for a course assignment). I have a program that has to change itself during runtime. The easiest way I thought to do this would be to to add blank lines to the executable, by creating a file with a few "\n" in them, and then concatenating them using a system call. It works! But only once.

However, if I manually go through and add a new line to the .exe and run it, it never stops me. I don't need to recompile...which is weird.

My thought was that maybe bash thinks I'm up to something...and wants to stop it, which also is understandable. However, I'm just doing my homework, so I hope this isn't the case.

Could anyone shed some light on this matter? Does changing the executable, even if it doesn't hinder its ability to run, cause some problem or issue with permissions?
 

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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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