Reverse
reverse DNS lookup CLI for standard output
Installation
$ gem install reverse
Usage
Usage: reverse [options]
-V, --verion Show version number and quit
-v, --verbose Verbose Mode (IP Address with reverse DNS)
--no-color No Color Mode
$ cat /var/log/maillog | reverse
$ tail -f /var/log/maillog | reverse
$ grep Accepted /var/log/secure | reverse -v