You can have your script read a text file that has the server names given one below the other. Then, your script would read each line of the text file, pick up the servername, do a ping or an nslookup and if thats successful, it would execute the command. To remotely execute the commands, try the Net::SSH2 Module or Net::SSH::Any module.
Net::SSH2 comes pre installed with Strawberry Perl or DWIM Perl. Net::SSH::Any you'll have to install and it will run on top of Net::SSH2. Hope this helps.
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