$0-$9 You can access parameters greater than 9 with parameter expansion. ${10}

• $# Number of arguments

• use shift to get all parameters with a loop

  #!/bin/bash
  # posit-param2: script to display all arguments
  count=1
  while [[ $# -gt 0 ]]; do
      echo "Argument $count = $1"
      count=$((count + 1))
      shift
  done
  

• A useful trick is to PROGNAME="$(basename "$0")" in the usage for the program name.

• You can use positional parameters to pass arguments to functions:

  file_info () {
      # file_info: function to display file information
  
      if [[ -e "$1" ]]; then
          echo -e "\nFile Type:"
          file "$1"
          echo -e "\nFile Status:"
          stat "$1"
      else
          echo "$FUNCNAME: usage: $FUNCNAME file" >&2
          return 1
      fi
  }
  

  Note: FUNCNAME is a shell variable, can be updated to keep track of currently executed function.