Handy options for handling command line arguments within your shell scripts. These aren’t necessarily the best, but they’ll get you started.
Option 1: Using Case
#!/bin/bash
while getopts c:i:r: flag
do
case "${flag}" in
c) cloud=${OPTARG};;
i) instance=${OPTARG};;
r) region=${OPTARG};;
esac
done
echo "Cloud: $cloud";
echo "Instance: $instance";
echo "Region: $region";Option 2: Simplistic
#!/bin/bash
if [ "$#" -lt 3 ]; then
echo "Illegal number of parameters:"
echo -e "<cloud> <instance> <region>"
echo -e "cloud: ie, gcp | aws | azure"
echo -e "instance: ie, the-instance"
echo -e "region: ie, us-central1-a"
exit 1
fi
cloud=$1
instance=$2
region=$3
