![]() ![]() To do this, we choose All fields options and tick check mark against the name of these new fields as shown in below image â Displaying the calculated FieldsĪfter choosing the fields above, we are able to see the calculated fields in the search result as shown below. We add new fields created above to the list of fields we display as part of the search result. # Extract the first 3 characters of the name of the day. # divide the bytes with 1024 and store it as a field named byte_in_GB We are going to apply the below two calculations â This function stores the result of the calculation in a new field. To create calculated field, we use the eval function. This Splunk search is an example on how to remove unwanted values from multivalue fields using mvfilter. The mvcombine command does not apply to internal fields. The eval and where commands support functions, such as mvcount (), mvfilter (), mvindex (), and mvjoin () that you can use with multivalue fields. eval vulnagelastSeen-firstSeen will give you the difference between firstSeen and lastSeen. The specified field becomes a multivalue field that contains all of the single values from the combined events. Calculating the delta is very easy with the epoch timestamps, so you wont need the evals you posted. The existing values in these two fields is shown in the image below â Using the eval Function Description Takes a group of events that are identical except for the specified field, which contains a single value, and combines those events into a single event. But we need to display only the first three characters. Similarly, the date_wday displays complete name of the week day. Like eval userappUser.''.appDomain If you (or your users) dont want to have to specify that in every search though, you kind of can concatenate your appUser and appDomain values to.We need to apply this calculation to the bytes field. Quick and easy solution would be to use eval or strcat to concatenate the field values together. This will require the field to be divided by 1024 to get the GB value. The value in the bytes field is the number of bytes. The Web_application log file has two fields named bytes and date_wday. We need to apply certain Splunk function to achieve this manipulation of the field and store the new result under a new field name. This is made possible by using the concept of calculated fields in Splunk search.Ī simplest example is to show the first three characters of a week day instead of the complete day name. We also want to store the result of these calculations as a new field to be referred later by various searches. Many times, we will need to make some calculations on the fields that are already available in the Splunk events.
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