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Operating Systems Solaris Difference between hard link and copy command Post 302378233 by rogerben on Monday 7th of December 2009 09:50:04 AM
Old 12-07-2009
Quote:
Originally Posted by pupp
if you change the content for both the original file or the hardlink, the content is changed in the original file (thus changed in the hardlink). if you change the content in a copied file, the original file doesn't change its content. just the file you decided to edit.

Code:
-bash-3.00# echo test >> orig.file
-bash-3.00# cat orig.file
 
test
-bash-3.00# ln orig.file hardlink.file
-bash-3.00# cat orig.file
 
test
-bash-3.00# cat hardlink.file
 
test

both files have same content

Code:
-bash-3.00# echo hard test >> hardlink.file
-bash-3.00# cat hardlink.file
 
test
hard test
-bash-3.00# cat orig.file
 
test
hard test

edit hardlink.file and all content changes

Code:
-bash-3.00# cp orig.file copied.file
-bash-3.00# cat copied.file
 
test
hard test
-bash-3.00# echo copy test >> copied.file
-bash-3.00# cat copied.file
 
test
hard test
copy test
-bash-3.00# cat orig.file
 
test
hard test
-bash-3.00# cat hardlink.file
 
test
hard test

change to copied file doesn't show same with original file but hardlink and orig file show same content.

Thanks for your nice reply,.
rogerben
 

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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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