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Full Discussion: Idea to make a function as microservice
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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LEARN ABOUT CENTOS

openvt

OPENVT(1)							     Linux 1.x								 OPENVT(1)

NAME

       openvt - start a program on a new virtual terminal (VT).

SYNOPSIS

       openvt [-c vtnumber] [OPTIONS] [--] command

DESCRIPTION

       openvt  will  find the first available VT, and run on it the given command with the given command options, standard input, output and error
       are directed to that terminal. The current search path ($PATH) is used to find the requested command. If no command is specified  then  the
       environment variable $SHELL is used.

   OPTIONS
       -c, --console=VTNUMBER
	      Use the given VT number and not the first available. Note you must have write access to the supplied VT for this to work;

       -f, --force
	      Force opening a VT without checking whether it is already in use;

       -e, --exec
	      Directly execute the given command, without forking.  This option is meant for use in /etc/inittab;

       -s, --switch
	      Switch to the new VT when starting the command. The VT of the new command will be made the new current VT;

       -u, --user
	      Figure out the owner of the current VT, and run login as that user.  Suitable to be called by init. Shouldn't be used with -c or -l;

       -l, --login
	      Make the command a login shell. A - is prepended to the name of the command to be executed;

       -v, --verbose
	      Be a bit more verbose;

       -w, --wait
	      wait  for command to complete. If -w and -s are used together then openvt will switch back to the controlling terminal when the com-
	      mand completes;

       -V, --version
	      print program version and exit;

       -h, --help
	      show this text and exit.

       --     end of options to openvt.

NOTE

       If openvt is compiled with a getopt_long() and you wish to set options to the command to be run, then you must supply the end of options --
       flag before the command.

EXAMPLES

       openvt can be used to start a shell on the next free VT, by using the command:

       openvt bash

       To start the shell as a login shell, use:

       openvt -l bash

       To get a long listing you must supply the -- separator:

       openvt -- ls -l

HISTORY

       Earlier, openvt was called open.  It was written by Jon Tombs <jon@gtex02.us.es or jon@robots.ox.ac.uk>.  The -w idea is from "sam".

SEE ALSO

       chvt(1), doshell(8), login(1)

19 Jul 1996							       V1.4								 OPENVT(1)

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