Question

Do you know how to determine each job execution count for given period?

Answer 1

The following XPath expression will return the number of builds with timestamps between 1329817773921 and 1329834427888 for job MyJobName:

http://[jenkins_server]/api/xml?depth=2&xpath=string(count(/hudson/job[name='MyJobName']/build[timestamp>=1329817773921 and timestamp<=1329834427888]))

The timestamps themselves are the standard number of milliseconds since the epoch.

The following XPath can be used to determine the number of different jobs on the server:

http://[jenkins_server]/api/xml?depth=2&xpath=string(count(/hudson/job))

The following XPath can be used to determine the name of the third job on the server:

http://[jenkins_server]/api/xml?depth=2&xpath=/hudson/job[3]/name/text()

You can write a short shell script that combines those queries executed via wget to get the desired result.