Recursive search on the filesystem for the content of a log-file

I had the following problem lately:

On a test server I was looking for a log-file on the installation path and/or one of its sub-folders with some information about a "session timeout".

I didn't know the the log-files name, but new, that it had the extension ".log". I also didn't know which exception was was creating the entry. All I had, was the string "session timeout".

With the following Groovy script I could find all the log-files containing the string "session timeout" and from there it was easy to identify the log-file.

def dir = 'C:/some_installation_folder'
def fileExtension = '.log'
def searchString = 'session timeout'

new File(dir).eachFileRecurse() { f ->
    if (f.directory) {
        def p = ~/.*\${fileExtension}/
        f.eachFileMatch(p) { log ->
            def exceptions = []

            log.eachLine { ln ->
                if (ln =~ '.*' + searchString + '.*') {
                    exceptions << "${ln}"
                }
            }

            if (!exceptions.empty) {
                println log
                exceptions.each{println "    $it"}
            }
        }
    }
}

Enjoy! :)