Shell script with function and parameter as Variables

Question

i got a shell script where the function name and its parameters is stored in variables. I don't know how to call it. I tried it with eval and without, but nothing works correctly.

example of my code:

VarFunction="Testfunc1"
VarName="Peter"
VarLastname="Lustig"
VarText="Is a really lucky guy!\n Maybe he knows some funny Stuff?"

eval ${VarFunction} "$VarName" "$VarLastname" "$VarText"


Testfunc1() {
     Name=$1
     LastName=$2
     Text=$3

     echo $Name 
     echo $Lastname
     echo $Text

}

When the function itself is not a variable, the script works fine.

Testfunc1 "$VarName" "$VarLastname" "$VarText"

But i want to call a function dynamicly.

How can i do that?

Thanks and greetings

Danloc

Answer 1

This is about where you put the function definition. If you declare the function before it's called, you can call it even by variable. Try this:

VarFunction="Testfunc1"
VarName="Peter"
VarLastname="Lustig"
VarText="Is a really lucky guy!\n Maybe he knows some funny Stuff?"
Testfunc1() {
     Name=$1
     LastName=$2
     Text=$3

     echo $Name 
     echo $Lastname
     echo $Text 
}
${VarFunction} "$VarName" "$VarLastname" "$VarText"

Answer 2

Define the function at the beginning. It works fine. What I understand is in shell, you need to define function first, before it is called.

#!/usr/bin/bash
Testfunc1() {
     Name=$1
     LastName=$2
     Text=$3

     echo $Name
     echo $Lastname
     echo $Text

}

VarFunction="Testfunc1"
VarName="Peter"
VarLastname="Lustig"
VarText="Is a really lucky guy!\n Maybe he knows some funny Stuff?"

${VarFunction} "$VarName" "$VarLastname" "$VarText"