sort

Description

The sort command sorts all of the results by the specified fields. Results missing a given field are treated as having the smallest or largest possible value of that field if the order is descending or ascending, respectively.

If the first argument to the sort command is a number, then at most that many results are returned, in order. If no number is specified, the default limit of 10000 is used. If the number 0 is specified, all of the results are returned. See the count argument for more information.

Syntax

The required syntax is in bold.

sort

[<count>]

<sort-by-clause>...

[desc]

Required arguments

<sort-by-clause>

Syntax: ( - | + ) <sort-field>, ( - | + ) <sort-field> ...

Description: List of fields to sort by and the sort order. Use a minus sign (-) for descending order and a plus sign (+) for ascending order. When specifying more than one field, separate the field names with commas. See Sort field options.

Optional arguments

<count>

Syntax: <int> | limit=<int>

Description: Specify the number of results to return from the sorted results. If no count is specified, the default limit of 10000 is used. If 0 is specified, all results are returned. You can specify the count using an integer or precede the count with a label, for example limit=10.

Using sort 0 might have a negative impact performance, depending on how many results are returned.

Default: 10000

desc

Syntax: d | desc

Description: Reverses the order of the results. If multiple fields are specified, reverses the order of the values in the fields in the order in which the fields are specified. For example, if there are three fields specified, the desc argument reverses the order of the values in the first field. For each set of duplicate values in the first field, reverses the order of the corresponding values in the second field. For each set of duplicate values in the second field, reverses the order of the corresponding values in the third field.

Sort field options

<sort-field>

Syntax: <field> | auto(<field>) | str(<field>) | ip(<field>) | num(<field>)

Description: Options you can specify with <sort-field>.

<field>

Syntax: <string>

Description: The name of field to sort.

auto

Syntax: auto(<field>)

Description: Determine automatically how to sort the values of the field.

ip

Syntax: ip(<field>)

Description: Interpret the values of the field as IP addresses.

num

Syntax: num(<field>)

Description: Interpret the values of the field as numbers.

str

Syntax: str(<field>)

Description: Interpret the values of the field as strings and order the values alphabetically.

Usage

By default, sort tries to automatically determine what it is sorting. If the field takes on numeric values, the collating sequence is numeric. If the field takes on IP address values, the collating sequence is for IPs. Otherwise, the collating sequence is in lexicographical order. Some specific examples are:

• Alphabetic strings are sorted lexicographically.
• Punctuation strings are sorted lexicographically.
• Numeric data is sorted as you would expect for numbers and the sort order is specified as ascending or descending.
• Alphanumeric strings are sorted based on the data type of the first character. If the string starts with a number, the string is sorted numerically based on that number alone. Otherwise, strings are sorted lexicographically.
• Strings that are a combination of alphanumeric and punctuation characters are sorted the same way as alphanumeric strings.

In the default automatic mode for a field, the sort order is determined between each pair of values that are compared at any one time. This means that for some pairs of values, the order might be lexicographical, while for other pairs the order might be numerical. For example, if sorting in descending order 10.1 > 9.1, but 10.1.a < 9.1.a.

Lexicographical order

Lexicographical order sorts items based on the values used to encode the items in computer memory. In Splunk software, this is almost always UTF-8 encoding, which is a superset of ASCII.

• Numbers are sorted before letters. Numbers are sorted based on the first digit. For example, the numbers 10, 9, 70, 100 are sorted lexicographically as 10, 100, 70, 9.
• Uppercase letters are sorted before lowercase letters.
• Symbols are not standard. Some symbols are sorted before numeric values. Other symbols are sorted before or after letters.

Custom sort order

You can specify a custom sort order that overrides the lexicographical order. See the blog Order Up! Custom Sort Orders.

Basic examples

1. Use the sort field options to specify field types

Sort results by "ip" value in ascending order and then sort by the "url" value in descending order.

... | sort num(ip), -str(url)

2. Specifying the number of results to sort

Sort first 100 results in descending order of the "size" field and then by the "source" value in ascending order. This example specifies the type of data in each of the fields. The "size" field contains numbers and the "source" field contains strings.

... | sort 100 -num(size), +str(source)

3. Specifying descending and ascending sort orders

Sort results by the "_time" field in ascending order and then by the "host" value in descending order.

... | sort _time, -host

4. Changing the time format of events for sorting

Change the format of the event's time and sort the results in descending order by the Time field that is created with the eval command.

... | bin _time span=60m | eval Time=strftime(_time, "%m/%d %H:%M %Z") | stats avg(time_taken) AS AverageResponseTime BY Time | sort - Time

(Thanks to Splunk user Ayn for this example.)

5. Return the most recent event

Return the most recent event:

... | sort 1 -_time

6. Use a label with the <count>

You can use a label to identify the number of results to return: Return the first 12 results, sorted by the "host" field in descending order.

... | sort limit=12 host

Extended example

1. Specify a custom sort order

Sort a table of results in a specific order, such as days of the week or months of the year, that is not lexicographical or numeric. For example, suppose you have a search that produces the following table:

Day	Total
Friday	120
Monday	93
Tuesday	124
Thursday	356
Weekend	1022
Wednesday	248

Sorting on the day field (Day) returns a table sorted alphabetically, which does not make much sense. Instead, you want to sort the table by the day of the week, Monday to Friday, with the Weekend at the end of the list.

To create a custom sort order, you first need to create a field called sort_field that defines the order. Then you can sort on that field.

... | eval wd=lower(Day) | eval sort_field=case(wd=="monday",1, wd=="tuesday",2, wd=="wednesday",3, wd=="thursday",4, wd=="friday",5, wd=="weekend",6) | sort sort_field | fields - sort_field

This search uses the eval command to create the sort_field and the fields command to remove sort_field from the final results table.

The results look something like this:

Day	Total
Monday	93
Tuesday	124
Wednesday	248
Thursday	356
Friday	120
Weekend	1022

(Thanks to Splunk users Ant1D and Ziegfried for this example.)

For additional custom sort order examples, see the blog Order Up! Custom Sort Orders and the Extended example in the rangemap command.

See also

reverse