Pass Parameters to a Function

We can define a function that will accept parameters while calling the function. These parameters would be represented by $1, $2 and so on.

Functions can be Recursive.

A function may return a value in one of four different ways:

  • Change the state of a variable or variables
  • Use thereturncommand to end the function, and return the supplied value to the calling section of the shell script
  • echo output to stdout, which will be caught by the caller just as expr $a + $b is caught
  • we can get the function name using FUNCNAME variable.

If you execute anexitcommand from inside a function, its effect is not only to terminate execution of the function but also of the shell program that called the function.

If you instead want to just terminate execution of the function, then there is way to come out of a defined function.

Based on the situation you can return any value from your function using thereturncommand whose syntax is as follows −

return code

Here code can be anything you choose here, but obviously, you should choose something that is meaningful or useful in the context of your script as a whole.



function install(){
  echo "executing ${FUNCNAME} - start"
  echo "installing ${1}"
  echo "executing ${FUNCNAME} - end"
function configuration(){
  echo "config ${1}"
  echo "${FUNCNAME}"

function deploy() {
  echo "deploying ${1}"
  echo "${FUNCNAME}"
install "nginx"
configuration "nginx"
deploy "webapplication"


└─$ ./
executing install - start
installing nginx
executing install - end
config nginx
deploying webapplication

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