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I have input list with full enterprise host list(/home/completehostlistcheck.txt). Depending on which environment it lies (compare the input from dev=/home/dev.txt and prod=/home/prod.txt) run echo and say which environment it lies. Problem is case syntax is not working

#!/bin/bash

dev=/home/dev.txt
prod=/home/prod.txt

for host in $(</home/completehostlistcheck.txt) 
do 
ssh $host

chk=$hostname
  case "$chk" in
dev) echo "this is dev"
;;
prod) echo "this is prod"
;;

esac 
done
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2 Answers 2

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If you know the differences between your development hosts and your production hosts, or if there's a simple naming convention (e. g. dev.example.com vs. prod.example.com), this could be as simple as:

for host in $(</home/completelistlistcheck.txt); do
    case "$(ssh $host hostname)" in
        *dev*)
            env="development"
            break
            ;;
        *prod*)
            env="production"
            break
            ;;
        *)
            env="non-categorized"
            break
            ;;
    esac
    echo "$host is a $env host."
done

If there is a file on each host that you're needing to parse the contents of, use cat /path/to/file rather than hostname in the command run via ssh.

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  • Let me make it this way, I have 4 host environments, A, B, C and D. There is one input list which has total of 50 hostnames, So now, all I need to do is first grab the first hostname from input list, match it to environment (A,B,C or D) and then run a script depending on the environment it belongs to. If first host belongs to environment A, then script1, else if it belongs to environment B then script 2 FYI., A, B, C and D all have few hosts which should be one among those 50 Commented Apr 30, 2018 at 19:10
  • @user227863 Can you tell us how you currently match a hostname to its environment? The code in your question has chk=$hostname and then assumes $chk is something like "dev", but there's no code shown that sets hostname. Commented Apr 30, 2018 at 21:20
  • So when I save envrionment A, B, C and D. It means they are some file location, A : /home/dev.txt, B /home/prod.txt, C /home/test.txt which have list of hosts. So input list which I give initially should look at all these environments text files (file paths A, B, C and D), find a input and run script depending on the envrionment. Let me know if this is clear now. And sorry, I should have mentioned it more clearly. Any help is much appreciated. FYI., I'm looking to get this worked using case statement only Commented May 1, 2018 at 11:13
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There are several problems:

hostname

Unless your login makes sure that this variable exists you should use the command hostname instead:

chk=$(hostname)

ssh

ssh $host just makes a login and waits for terminal input then. The following command is executed after ssh exits. You have to add a command to the ssh call. It would be a bit much to pass the whole case stuff to ssh but as I understand it you need only the result of hostname:

chk="(ssh "$host" hostname)"
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  • Let me make it this way, I have 4 host environments, A, B, C and D. There is one input list which has total of 50 hostnames, So now, all I need to do is first grab the first hostname from input list, match it to environment (A,B,C or D) and then run a script depending on the environment it belongs to. If first host belongs to environment A, then script1, else if it belongs to environment B then script 2 Commented Apr 30, 2018 at 19:07

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