Shell Programming and Scripting

#!/bin/sh
PROGS='ntp apache mysql'

set -e

if [ "$#" -eq 0 ]
then
        echo "Usage: test.sh {install-i prog|remove-r prog}"
        exit 1
fi

install() {
     echo "so you want to install $PROGS? (y/n)"

     read reponse

     if [[ $reponse == "y" ]]
       then apt-get install $PROGS
     fi
}

./myscript.sh -install package name

./myscript.sh -remove package name

cat test.sh

#!/bin/sh
while getopts ":n:a:m:" opt; do
  case $opt in
    n)
      installing command for ntp
      ;;
    a)
      installing command for apache
      ;;
    m)
      installing command for mysql
     ;;
    \?)
      echo "Invalid option: -$OPTARG" >&2
      ;;
  esac
done

./test.sh -a apache , ./test.sh -n ntp , ./test.sh -m mysql