Simple code that illustrates the difference between `$*` and `$@` in shell scripting.

'$*' and '$@' in Shell Scripting

#!/bin/bash

foo() {
  printf "'%s'" $*
}

bar() {
  printf "'%s'" $@
}

foofoo() {
  printf "'%s'" "$*"
}

barbar() {
  printf "'%s'" "$@"
}

foo 1 2 "3 4"    # '1''2''3''4'
bar 1 2 "3 4"    # '1''2''3''4'
foofoo 1 2 "3 4" # '1 2 3 4'
barbar 1 2 "3 4" # '1''2''3 4'

# Generally, we should use `"$@"` in case the parameter contains
# `IFS` character, `$*` or `$@` is safe if the the parameter does
# not contain `IFS` character, nerver use `"$*"`.