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Top Forums UNIX for Beginners Questions & Answers Idea to make a function as microservice Post 303037090 by rbatte1 on Tuesday 23rd of July 2019 06:27:02 AM
Old 07-23-2019
You could source the script with the function in it, perhaps that is what you need.
Code:
$ cat my_function_script.sh
function welcome () {
   echo "Hello there"
}

$ cat my_call_script.sh
source ./my_function_script.sh
echo "Get ready for a greeting ....."
welcome
echo "I hope you liked your greeting"
echo

$ ./my_call_script.sh
Get ready for a greeting .....
Hello there
I hope you liked your greeting

$

Does that do the sort of thing you need? You may also see the shortcut of . instead of source but it;'s a little less clear and more difficult to search for. You would end up with a line like . ./my_function_script.sh

Either way, the script being sourced is executed in the current shell so the declared functions remain available. You have to be careful that you really want to run it, so most people have a block on functions only in what they source in.




I hope that this helps,
Robin

Last edited by rbatte1; 07-23-2019 at 07:30 AM.. Reason: Managed to double-up CODE tags
 

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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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