Parse Flags with getopts

Write the executable script /home/student/bin/deploy.sh with this interface:

deploy.sh [-e ENV] [-n] [-v] SERVICE

Task

• -e ENV picks the environment: staging or production. The default is staging.
• Without -n it prints deploying SERVICE to ENV. With -n (dry run) it prints DRY RUN: deploying SERVICE to ENV instead. Both go to stdout and the script exits 0.
• -v additionally prints verbose: on to stderr.
• Options can come in any order and can be combined (-nv).
• Exit 2 with the line usage: deploy.sh [-e ENV] [-n] [-v] SERVICE on stderr when: SERVICE is missing, an unknown option is given, -e has no value, or ENV is not staging or production.

For example, deploy.sh -n -e production pulse prints DRY RUN: deploying pulse to production.