Splunk Quick Reference Guide

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QUICK REFERENCE GUIDE
ID numbers by giving them more descriptive
names.
Events that match a specified search string can
be saved as event types. Tag event types to
organize your data into categories.
During index-time processing, data is read from
a source on a host and is classified into a source
type. Timestamps are extracted, and the data is
parsed into individual events. Line-breaking rules
are applied to segment the events to display in
the search results. Each event is written to an
index on disk, where the event is later retrieved
with a search request.
When a search starts, referred to as search-time,
indexed events are retrieved from disk. Fields are
extracted from the raw text for the event.
When data is added, Splunk software parses
the data into individual events, extracts the
timestamp, applies line-breaking rules, and
stores the events in an index. You can create new
indexes for dierent inputs. By default, data is
stored in the “main” index. Events are retrieved
from one or more indexes during a search.
Core Features
Search is the primary way users navigate data
in Splunk software. You can write a search to
retrieve events from an index, use statistical
commands to calculate metrics and generate
reports, search for specific conditions within a
rolling time window, identify patterns in your
data, predict future trends, and so on. You
transform the events using the Splunk Search
Process Language (SPL). Searches can be
saved as reports and used to power dashboards.
Reports are saved searches and pivots. You can
run reports on an ad hoc basis, schedule reports
to run on a regular interval, or set a scheduled
report to generate alerts when the results meet
particular conditions. Reports can be added to
dashboards as dashboard panels.
Dashboards are made up of panels that contain
modules such as search boxes, fields, and data
visualizations. Dashboard panels are usually
connected to saved searches or pivots. They
can display the results of completed searches,
as well as data from real-time searches.
Alerts are triggered when search results meet
specific conditions. You can use alerts on
historical and real-time searches. Alerts can be
configured to trigger actions such as sending
alert information to designated email addresses
or posting alert information to a web resource.
Additional Features
(Splunk Enterprise only)
A data model is a hierarchically-organized
collection of datasets that Pivot uses to
generate reports. Data model objects represent
individual datasets, which the data model is
composed of.
Pivot refers to the table, chart, or other visualization
you create using the Pivot Editor. You can map
attributes defined by data model objects to
data visualizations, without manually writing the
searches. Pivots can be saved as reports and used
to power dashboards.
Apps are a collection of configurations,
knowledge objects, and customer designed
views and dashboards. Apps extend the
Splunk environment to fit the specific needs of
organizational teams such as Unix or Windows
system administrators, network security
specialists, website managers, business
analysts, and so on. A single Splunk Enterprise
or Splunk Cloud installation can run multiple
apps simultaneously.
A distributed search provides a way to scale
your deployment by separating the search
management and presentation layer from the
indexing and search retrieval layer. You use
distribute search to facilitate horizontal scaling
for enhanced performance, to control access
to indexed data, and to manage geographically
dispersed data.
Splunk Components
A Splunk instance that forwards data to another
Splunk instance is referred to as a forwarder.
An indexer is the Splunk instance that indexes
data. The indexer transforms the raw data into
events and stores the events into an index.
The indexer also searches the indexed data in
response to search requests. The search peers
are indexers that fulfill search requests from the
search head.
In a distributed search environment, the search
head is the Splunk instance that directs search
requests to a set of search peers and merges
the results back to the user. If the instance
does only search and not indexing, it is usually
referred to as a dedicated search head.
Concepts
An event is a set of values associated with a
timestamp. It is a single entry of data and can
have one or multiple lines. An event can be a
text document, a configuration file, an entire
stack trace, and so on. This is an example of an
event in a web activity log:
173.26.34.223 - - [01/
Mar/2015:12:05:27 -0700] “GET /
trade/app?action=logout HTTP/1.1”
200 2953
You can also define transactions to search for
and group together events that are conceptually
related but span a duration of time. Transactions
can represent a multistep business-related
activity, such as all events related to a single
customer session on a retail website.
A host is the name of the physical or virtual
device where an event originates. The host field
provides an easy way to find all data originating
from a specific device. A source is the name
of the file, directory, data stream, or other
input from which a particular event originates.
Sources are classified into source types, which
can be either well known formats or formats
defined by the user. Some common source
types are HTTP web server logs and Windows
event logs.
Events with the same source types can
come from dierent sources. For example,
events from the file source=/var/log/
messages and from a syslog input port
sourc e=UDP:514 often share the source type,
sourcetype=linux_syslog
Fields are searchable name and value pairings
that distinguish one event from another. Not
all events have the same fields and field values.
Using fields, you can write tailored searches to
retrieve the specific events that you want. When
Splunk software processes events at index-time
and search-time, the software extracts fields
based on configuration file definitions and user-
defined patterns.
Use the Field Extractor tool to automatically
generate and validate field extractions at search-
time. Regular expressions are automatically
generated to extract fields. You can extract
fields from events where values are separated by
spaces, commas, or other characters.
A tag is a knowledge object that enables you to
search for events that contain particular field
values. You can assign one or more tags to any
field/value combination, including event types,
hosts, sources, and source types. Use tags to
group related field values together, or to track
abstract field values such as IP addresses or
Events
Index-Time and Search Time
Indexes
Search
Reports
Dashboards
Alerts
Fields
Tags
Host, Source, and Source Type
Data Model
Pivot
Apps
Distributed Search
Forwarders
Indexer
Search Head
QUICK REFERENCE GUIDE
A subsearch runs its own search and returns the
results to the parent command as the argument
value. The subsearch is run first and is contained
in square brackets. For example, the following
search uses a subsearch to find all syslog events
from the user that had the last login error:
sourcetype=syslog [ search login
error | return 1 user ]
The key to fast searching is to limit the data
that needs to be pulled o disk to an absolute
minimum. Then filter that data as early as
possible in the search so that processing is done
on the minimum data necessary.
Partition data into separate indexes, if you will
rarely perform searches across multiple types
of data. For example, put web data in one index,
and firewall data in another.
Limit the time range to only what is needed. For
example -1h not -1w, or ea rl ie st=-1d .
Search as specifically as you can. For example,
fatal _ error not *error*
Filter out results as soon as possible before
calculations. Use field-value pairs, before the
first pipe. For example, >ERROR status=404
|… instead of >ERROR | search
status=404… Or use filtering commands such
as where.
Filter out unnecessary fields as soon as possible
in the search.
Postpone commands that process over the
entire result set (non-streaming commands) as
late as possible in your search. Some of these
commands are: dedup, sort, and stats.
Use post-processing searches in dashboards.
Use summary indexing, and report and data
model acceleration features.
Search Processing
Language
A Splunk search is a series of commands and
arguments. Commands are chained together with
a pipe “|” character to indicate that the output of
one command feeds into the next command on
the right.
search | command1 arguments1 |
command2 arguments2 | ...
At the start of the search pipeline, is an
implied search command to retrieve events
from the index. Search requests are written
with keywords, quoted phrases, Boolean
expressions, wildcards, field name/value pairs,
and comparison expressions. The AND operator
is implied between search terms. For example:
sourcetype=access _ combined error |
top 5 uri
This search retrieves indexed web activity
events that contain the term “error. For those
events, it returns the top 5 most common URI
values.
Search commands are used to filter unwanted
events, extract more information, calculate
values, transform, and statistically analyze
the indexed data. Think of the search results
retrieved from the index as a dynamically
created table. Each indexed event is a row. The
field values are columns. Each search command
redefines the shape of that table. For example,
search commands that filter events will remove
rows, search commands that extract fields will
add columns.
You can specify a time range to retrieve events
inline with your search by using the latest
and earliest search modifiers. The relative
times are specified with a string of characters to
indicate the amount of time (integer and unit)
and an optional “snap to” time unit. The syntax is:
[+|-]< i nte g er> < u n it >@< s n ap _ t i m e _
unit>
The search “error earliest=-1d@d
latest=-h@h” retrieves events containing
“error” that occurred yesterday snapping to the
beginning of the day (00:00:00) and through
to the most recent hour of today, snapping on
the hour.
The snap to time unit rounds the time down. For
example, if it is 11:59:00 and you snap to hours
(@h), the time used is 11:00:00 not 12:00:00.
You can also snap to specific days of the week
using @w0 for Sunday, @w1 for Monday, and so on.
Subsearches
Time Modifiers
Optimizing Searches
Common Search Commands
Command Description
chart/
timechart
Returns results in a tabular
output for (time-series)
charting.
dedup
Removes subsequent
results that match a
specified criterion.
eval
Calculates an expression.
See COMMON EVAL
FUNCTIONS.
elds Removes fields from
search results.
head/tail Returns the first/last N
results.
lookup Adds field values from an
external source.
rename
Renames a field. Use
wildcards to specify
multiple fields.
rex
Specifies regular
expression named groups
to extract fields.
search
Filters results to those
that match the search
expression.
sort Sorts the search results by
the specified fields.
stats
Provides statistics,
grouped optionally by
fields. See COMMON
STATS FUNCTIONS.
table
Specifies fields to keep in
the result set. Retains data
in tabular format.
top/rare Displays the most/least
common values of a field.
transaction Groups search results into
transactions.
where
Filters search results using
eval expressions. Used
to compare two dierent
fields.
Splunk Inc.
250 Brannan Street
San Francisco, CA 94107
www.splunk.com
docs.splunk.com
Copyright © 2016 Splunk Inc. All rights reserved. Splunk,
Splunk>, Listen to Your Data, The Engine for Machine
Data, Hunk, Splunk Cloud, Splunk Light, SPL and Splunk
MINT are trademarks and registered trademarks of
Splunk Inc. in the United States and other countries.
All other brand names, product names, or trademarks
belong to their respective owners.
QUICK REFERENCE GUIDE
Common Eval Functions
The eval command calculates an expression and puts the resulting value into a field (e.g. “...| eval
force = mass * acceleration”). The following table lists some of the functions used with the eval
command. You can also use basic arithmetic operators (+ - * / %), string concatenation (e.g., “...|
eval name = last . “,” . first”), and Boolean operations (AND OR NOT XOR < > <= >= != = == LIKE).
Function Description Examples
a b s( X) Returns the absolute value of X. abs(number)
c a s e( X," Y ", … )
Takes pairs of arguments X and Y, where X arguments are
Boolean expressions. When evaluated to TRUE, the arguments
return the corresponding Y argument.
case(error == 404, "Not found", error == 500,"Internal
Server Error", error == 200, "OK")
c e i l( X) Ceiling of a number X. ceil(1.9)
c i d r m a t c h (" X ",Y ) Identifies IP addresses that belong to a particular subnet. cidrmatch("123.132.32.0/25",ip)
c o a le sc e(X,…) Returns the first value that is not null. coalesce(null(), "Returned val", null())
c o s(X) Calculates the cosine of X. n=cos(0)
e x a ct( X) Evaluates an expression X using double precision floating
point arithmetic. exact(3.14*num)
e x p(X) Returns eX. exp(3)
if(X,Y,Z) If X evaluates to TRUE, the result is the second argument Y. If X
evaluates to FALSE, the result evaluates to the third argument Z. if(error==200, "OK", "Error")
i s b o o l( X) Returns TRUE if X is Boolean. isbool(field)
isi nt(X) Returns TRUE if X is an integer. isint(field)
i s n u l l( X ) Returns TRUE if X is NULL. isnull(field)
isst r() Returns TRUE if X is a string. isstr(field)
le n(X) This function returns the character length of a string X. len(field)
l i k e(X,"Y ") Returns TRUE if and only if X is like the SQLite pattern in Y. like(field, "addr%")
lo g(X,Y) Returns the log of the first argument X using the
second argument Y as the base. Y defaults to 10. log(number,2)
lo w e r(X) Returns the lowercase of X. lower(username)
lt r i m(X,Y) Returns X with the characters in Y trimmed from the
left side. Y defaults to spaces and tabs. ltrim(" ZZZabcZZ ", " Z")
m at c h(X,Y ) Returns if X matches the regex pattern Y. match(field, "^\d{1,3}\.\d$")
m a x(X,…) Returns the maximum. max(delay, mydelay)
m d 5( X) Returns the MD5 hash of a string value X. md5(field)
m i n(X,…) Returns the minimum. min(delay, mydelay)
m v c o u n t(X) Returns the number of values of X. mvcount(multifield)
m v  lt e r(X) Filters a multi-valued field based on the Boolean
expression X. mvfilter(match(email, "net$"))
mvindex(X,Y,Z) Returns a subset of the multivalued field X from start
position (zero-based) Y to Z (optional). mvindex( multifield, 2)
m v j oi n(X,Y) Given a multi-valued field X and string delimiter Y, and
joins the individual values of X using Y. mvjoin(address, ";")
no w() Returns the current time, represented in Unix time. now()
n u l l() This function takes no arguments and returns NULL. null()
nullif(X,Y) Given two arguments, fields X and Y, and returns the X
if the arguments are dierent. Otherwise returns NULL. nullif(fieldA, fieldB)
ra nd o m() Returns a pseudo-random number ranging from 0 to
2147483647. random()
relative _
time (X,Y)
Given epochtime time X and relative time specifier Y,
returns the epochtime value of Y applied to X. relative_time(now(),"-1d@d")
replace(X,Y,Z) Returns a string formed by substituting string Z for
every occurrence of regex string Y in string X.
Returns date with the month and day numbers
switched, so if the input was 4/30/2015 the return
value would be 30/4/2009: replace(date, "^(\d{1,2})/
(\d{1,2})/", "\2/\1/")
QUICK REFERENCE GUIDE
Common Eval Functions (continued)
Function Description Examples
r o u n d(X,Y) Returns X rounded to the amount of decimal places
specified by Y. The default is to round to an integer. round(3.5)
r t r i m( X,Y ) Returns X with the characters in Y trimmed from the right
side. If Y is not specified, spaces and tabs are trimmed. rtrim(" ZZZZabcZZ ", " Z")
searchmatch(X) Returns true if the event matches the search string X. searchmatch("foo AND bar")
s p l it( X," Y ") Returns X as a multi-valued field, split by delimiter Y. s plit(ad d r e ss, ";")
s q rt(X) Returns the square root of X. s q r t(9)
st r ft i m e(X,Y) Returns epochtime value X rendered using the format
specified by Y. strftime( _ time, "%H:%M")
st r p t i m e(X,Y) Given a time represented by a string X, returns value
parsed from format Y. strptime(timeStr, "%H:%M")
su bst r(X,Y,Z) Returns a substring field X from start position (1-based)
Y for Z (optional) characters. substr("string", 1, 3)
t i m e() Returns the wall-clock time with microsecond resolution. t i m e()
t o n u m b e r(X,Y ) Converts input string X to a number, where Y (optional,
defaults to 10) defines the base of the number to convert to. tonumber("0A4",16)
t o st r i n g(X,Y)
Returns a field value of X as a string. If the value of X is a number, it
reformats it as a string. If X is a Boolean value,, reformats to "True"
or "False". If X is a number, the second argument Y is optional
and can either be "hex" (convert X to hexadecimal), "commas"
(formats X with commas and 2 decimal places), or "duration"
(converts seconds X to readable time format HH:MM:SS).
This example returns: foo=615 and
foo2=00:10:15:
… | eval foo=615 | eval foo2 =
tostring(foo, “duration)
t y p e of(X) Returns a string representation of the field type.
This example returns:
“NumberStringBoolInvalid”: typeof(12)+
t y p e o f(“ s t r i n g ”)+
urldecode(X) Returns the URL X decoded. urldecode("http%3A%2F%2Fwww.splunk.
com%2Fdownload%3Fr%3Dheader")
validate|
(X,Y,)
Given pairs of arguments, Boolean expressions X and strings
Y, returns the string Y corresponding to the first expression X
that evaluates to False and defaults to NULL if all are True.
validate(isint(port), "ERROR: Port is not
an integer", port >= 1 AND port <= 65535,
"ERROR: Port is out of range")
Common Stats Functions Common statistical functions used with the chart, stats, and timechart commands. Field names
can be wildcarded, so avg(*delay) might calculate the average of the delay and xdelay fields.
a v g(X) Returns the average of the values of field X.
c o u nt(X) Returns the number of occurrences of the field X. To indicate a specific field value to match, format X as eval(field="value").
d c(X) Returns the count of distinct values of the field X.
e a rl i est(X ) Returns the chronologically earliest seen value of X.
l at e st( X) Returns the chronologically latest seen value of X.
m a x(X) Returns the maximum value of the field X. If the values of X are non-numeric, the max is found from alphabetical ordering.
m e d i a n(X) Returns the middle-most value of the field X.
m i n(X) Returns the minimum value of the field X. If the values of X are non-numeric, the min is found from alphabetical ordering.
m o d e(X) Returns the most frequent value of the field X.
p e rc <X>(Y) Returns the X-th percentile value of the field Y. For example, perc5(total) returns the 5th percentile value of a field "total".
r a n g e(X) Returns the dierence between the max and min values of the field X.
st d ev(X) Returns the sample standard deviation of the field X.
st d e v p(X) Returns the population standard deviation of the field X.
su m(X) Returns the sum of the values of the field X.
su m s q(X) Returns the sum of the squares of the values of the field X.
values(X) Returns the list of all distinct values of the field X as a multi-value entry. The order of the values is alphabetical.
v a r(X) Returns the sample variance of the field X.
QUICK REFERENCE GUIDE
Filter Results
Returns X rounded to the amount
of decimal places specified by
Y. The default is to round to an
integer.
rou nd(3.5)
Returns X with the characters in Y
trimmed from the right side. If Y is
not specified, spaces and tabs are
trimmed.
rtrim(" ZZZZabcZZ ", "
Z")
Returns true if the event matches
the search string X.
searchmatch("foo AND
bar")
Returns X as a multi-valued field,
split by delimiter Y. s plit(a d d r ess, ";")
Given pairs of arguments, Boolean
expressions X and strings Y,
returns the string Y corresponding
to the first expression X that
evaluates to False and defaults to
NULL if all are True.
valid ate(isint(port),
"ERROR: Port is not an
integer", port >= 1 AND
port <= 65535, "ERROR:
Port is out of range")
Order Results
Return the first 20 results. … | head 20
Reverse the order of a result set. … | reverse
Sort results by "ip" value (in
ascending order) and then by
"url" value (in descending order).
… | sort ip, -url
Return the last 20 results in
reverse order. … | tail 20
Reporting
Return the maximum "delay"
by "size", where "size" is broken
down into a maximum of 10 equal
sized buckets.
… | chart max(delay) by
size bins=10
Return max(delay) for each value
of foo split by the value of bar.
… | chart max(delay)
over foo by bar
Return max(delay) for each value
of foo.
… | chart max(delay)
over foo
Count the events by "host" … | stats count by host
Reporting (cont.)
Create a table showing the count
of events and a small line chart
… | stats sparkline
count by host
Create a timechart of the count
of from "web" sources by "host"
… | timechart count by
host
Calculate the average value of
"CPU" each minute for each
"host".
… | timechart span=1m
avg(CPU) by host
Return the average for each hour,
of any unique field that ends
with the string "lay" (e.g., delay,
xdelay, relay, etc).
… | stats avg(*lay) by
date _ hour
Return the 20 most common
values of the "url" field. … | top limit=20 url
Return the least common values
of the "url" field. … | rare url
Group Results
Cluster results together, sort
by their "cluster_count" values,
and then return the 20 largest
clusters (in data size).
… | cluster t=0.9
showcount=true | sort
limit=20 -cluster _ count
Group results that have the same
"host" and "cookie", occur within
30 seconds of each other, and do
not have a pause greater than 5
seconds between each event into a
transaction.
… | transaction host
cookie maxspan=30s
maxpause=5s
Group results with the same IP
address (clientip) and where the
first result contains "signon",
and the last result contains
"purchase".
… | transaction clientip
startswith="signon"
endswith="purchase"
Search Examples
Advanced Reporting
Compute the overall average
duration and add 'avgdur' as a
new field to each event where the
'duration' field exists
... | eventstats
avg(duration) as avgdur
Find the cumulative sum of bytes.
... | s t r e a m s t a t s
sum(bytes) as bytes _
total | timechart
max(bytes _ total)
Find anomalies in the field ‘Close_
Price’ during the last 10 years.
sourcetype=nasdaq
earliest=-10y |
anomalydetection Close _
Price
Create a chart showing the count
of events with a predicted value
and range added to each event in
the time-series.
... | timechart count |
predict count
Computes a five event simple
moving average for field
‘count’ and write to new field
‘smoothed_count.’
... | timechart count |
trendline sma5(count) as
smoothed _ count”
Add Fields
Set velocity to distance / time. … | eval
velocity=distance/time
Extract "from" and "to" fields
using regular expressions. If a
raw event contains "From: Susan
To: David", then from=Susan and
to=David.
| rex eld= _ raw
"From: (?<from>.*) To:
(? < t o >.*)"
Save the running total of "count"
in a field called "total_count".
… | accum count as
total _ count
For each event where 'count' exists,
compute the dierence between
count and its previous value and
store the result in 'countdi'.
… | delta count as
countdiff
Filter Fields
Keep only the "host" and "ip"
fields, and display them in that
order.
… | elds + host, ip
Remove the “host” and “ip” fields
from the results. … | elds - host, ip
QUICK REFERENCE GUIDE
Search Examples (continued)
Lookup Tables (Splunk Enterprise only)
For each event, use the lookup
table usertogroup to locate the
matching “user” value from the
event. Output the group field
value to the event
… | lookup usertogroup
user output group
Read in the usertogroup lookup
table that is defined in the
transforms.conf file.
… | inputlookup
usertogroup
Write the search results to the
lookup file “users.csv.
… | outputlookup users.
csv
Modify Fields
Rename the "_ip" field as
"IPAddress".
… | rename _ ip as
IPAddress
Multi-Valued Fields
Combine the multiple values of the
recipients field into a single value … | nomv recipients
Separate the values of the
"recipients" field into multiple field
values, displaying the top recipients
… | makemv delim=","
recipients | top
recipients
Create new results for each value
of the multivalue field "recipients" … | mvexpand recipients
Find the number of recipient values … | eval to _ count =
mvcount(recipients)
Find the first email address in the
recipient field
… | eval recipient _ rst
= m v i n d e x(re ci pie nt,0)
Find all recipient values that end
in .net or .org
… | eval netorg _
recipients = mvlter
m at c h(r e c ip i e nt,"\.n e t $")
OR match(recipient,"\.org$"))
Find the index of the first
recipient value match “\.org$”
… | eval orgindex =
mvnd(recipient, "\.org$")
Regular Expressions (Regexes)
Regular Expressions are useful in multiple areas: search commands regex
and rex; eval functions match() and replace(); and in field extraction.
Regex Note Example Explanation
\s white space \d\s\d digit space digit
\S not white space \d\S\d digit non-
whitespace digit
\d digit \d\d\d-\d\d-
\d\d\d\d SSN
\D not digit \D\D\D three non-digits
\w
word character
(letter, number,
or _)
\w\w\w three word chars
\W not a word
character \W\W\W three non-word
chars
[...] any included
character [a-z0-9#] any char that is a thru
z, 0 thru 9, or #
[^...] no included
character [^xyz] any char but x, y,
or z
*zero or more \w* zero or more words
chars
+one or more \d+ integer
?zero or one \d\d\d-?\d\d-
?\d\d\d\d
SSN with dashes
being optional
|or \w|\d word or digit
character
(?P<var>
...)
named
extraction
(?P<ssn>\d\d\d-
\d\d-\d\d\d\d)
pull out a SSN and
assign to 'ssn' field
(?: ...
)
logical or
atomic grouping (?:[a-zA-Z]|\d) alphabetic
character OR a digit
^start of line ^\d+ line begins with at
least one digit
$end of line \d+$ line ends with at
least one digit
{...} number of
repetitions \d{3,5} between 3-5 digits
\escape \[ escape the [
character
Common Date and Time Formatting
Use these values for eval functions strftime() and strptime(), and for
timestamping event data.
Time
%H 24 hour (leading zeros) (00 to 23)
%I 12 hour (leading zeros) (01 to 12)
%M Minute (00 to 59)
%S Second (00 to 61)
%N subseconds with width (%3N = millisecs,
%6N = microsecs, %9N = nanosecs)
%p AM or PM
%Z Time zone (EST)
%z Time zone oset from UTC, in hour and
minute: +hhmm or -hhmm. (-0500 for EST)
%s Seconds since 1/1/1970 (1308677092)
Days
%d Day of month (leading zeros) (01 to 31)
%j Day of year (001 to 366)
%w Weekday (0 to 6)
%a Abbreviated weekday (Sun)
%A Weekday (Sunday)
Months
%b Abbreviated month name (Jan)
%B Month name (January)
%m Month number (01 to 12)
Years
%y Year without century (00 to 99)
%Y Year (2015)
Examples
%Y-%m-%d 2014-12-31
%y-%m-%d 14-12-31
%b %d, %Y Jan 24, 2015
%B %d, %Y January 24, 2015
q|%d %b '%y
= %Y-%m-%d| q|25 Feb '15 = 2015-02-25|
For more info visit:
docs.splunk.com
SPLUNK_Reference_Guide_Tri_112

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