Passing arguments or parameters to functions

In certain situations, we may need to pass arguments or parameters to functions. In such situations, we can pass arguments as follows.

Calling the script with command-line parameters is as follows:

$ name arg1 arg2 arg3 . . .

Let's type a function as follows:

$  hello() { echo "Hello $1, let us be a friend."; }

Call the function in the command line as follows:

$ hello Ganesh

Output:

Hello Ganesh, let us be a friend

Let's write the script function_07.sh. In this script, we pass command-line parameters to the script as well as the function:

#!/bin/bash
quit()
{
   exit
}
ex()
{
      echo $1 $2 $3
}
ex Hello hi bye# Function ex with three arguments
ex World# Function ex with one argument
echo $1# First argument passed to script
echo $2# Second argument passed to script
echo $3# Third argument passed to script
quit
echo foo

Test the script as follows:

$ chmod +x function_07.sh
$ ./function_07.sh One Two Three

Output:

Hello hi bye
World
One
Two
Three...