Uly.me

cloud engineer

arguments

Check if Multiple Arguments

If your Bash script calls for 3 arguments, here’s how to check it.

if [ "$#" -ne 3 ]
then
  echo "Usage: ./script.sh project diskname policy"
  exit
fi

You can adjust -ne 3 to any number based on the number of required arguments.

SSH Script

Here’s my custom ssh script named login.sh using multiple arguments. 

#!/bin/bash
if [ $# -eq 0 ]
  then
    echo 'no server supplied'
        exit 1
fi
INPUT=$2
case "$INPUT" in
  abc)
    ssh user1@$1
    ;;
  def)
    ssh user2@$1
    ;;
  *)
    ssh user3@$1
    ;;
esac

How to use with expected outputs.

./login.sh
no server supplied
./login.sh server3 abc
ssh user1@server3
./login.sh server2 def
ssh user2@server2
./login.sh server1
ssh user3@server1