Skip to content

Sematext Logs CLI

Sematext Logs Command-line Interface enables viewing, searching, filtering, and analyzing of log entries. Currently it supports OS X and Linux.


npm install logsene-cli -g


git clone
cd logsene-cli && npm install
npm link

To test, simply run:

npm test

Sematext Logs

Sematext Logs is a centralized log management solution where you can ship your logs in bulk or real-time from all your servers.

Those logs are then aggregated by time and shown in Sematext, where you have the ability to search for specific terms, narrow down time ranges, filter fields, setup alerts and more.

Sematext Logs - Log Management

A quick rundown of most notable features of Sematext Logs:

  • All your logs accessible in one place
  • Control who sees which data
  • Be up and running within minutes -- there is nothing to install or maintain
  • Log Alerts & Anomaly Detection
  • Saved Views
  • Scheduled Reporting
  • Correlation of metrics and logs

Logsene CLI

Logsene CLI gives you capability to search through your logs from the command-line, which brings the awesome benefit of being able to pipe results toawk,sed,cut,sort,headand friends from the *nix command-line.

Imagine a situation where you suspected that your site were under a DoS attack.

You'd be interested in quickly finding out the top offenders. Here’s a one-liner that shows top originating IP addresses in the last 3 hours (also shows how to use the-fswitch to specify which field(s) to return - fieldhost, in this example):

$ logsene search -t 3h -f host | sort | uniq -c | sort -r | head

You can find more useful examples in the blog post that announced the release of Logsene CLI.

Logsene CLI Session

We define L-CLI session as a set of commands issued by the user, with no more than 30m between them. Every session has a set of configuration parameters that control the way L-CLI behaves. E.g. which Sematext account is used (--api-key); which Logs App is used (--app-key); is tracing information going to be displayed (--trace).

For controlling those settings, we useconfig setandconfig getcommands. For convenience reasons, you don't have to deal with API and APP keys manually. L-CLI automatically retrieves both keys on each session start, as users login (--api-key) and choose Logs App (--app-key). L-CLI then writes those parameters to the session configuration store and reuses them on each subsequent command, until the session times out.

The session primitives were introduced in order to enable frictionless multi-user experience, where all users may possibly be accessing L-CLI from the same box (while being SSHd into it), using the same Sematext account and possibly even the same Logs App.


Usage: logsene search [query] [OPTIONS]
  where OPTIONS may be:
    -q <query>      Query string (-q parameter can be omitted)
    -f <fields>     OPTIONAL Fields to return (defaults to all fields)
    -t <interval>   OPTIONAL datetime, duration or range (defaults to last hour)
    -s <size>       OPTIONAL Number of matches to return (d)efaults to 200)
    -o <offset>     OPTIONAL Number of matches to skip from the beginning (defaults to 0)
    -op AND         OPTIONAL Overrides default OR operator between multiple query terms
    --json          OPTIONAL Returns log entries in JSON instead of TSV format
    --sep           OPTIONAL Sets the separator between start and end of time ranges

  logsene search
      returns last 1h of log entries
      note: default return limit of 200 hits is always in effect unless you
            explicitly change it with the -s switch (where -s without params
            disables the limit altogether)

  logsene search -q ERROR
      returns last 1h of log entries that contain the term ERROR

  logsene search ERROR
      equivalent to the previous example

  logsene search UNDEFINED SEGFAULT
      returns last 1h of log entries that have either of the terms
      note: default operator is OR

  logsene search SEGFAULT Segmentation -op AND
      returns last 1h of log entries that have both terms
      note: convenience parameter --and has the same effect

  logsene search -q "Server not responding"
      returns last 1h of log entries that contain the given phrase

  logsene search "rare thing" -t 1y8M4d8h30m2s
      returns all the log entries that contain the phrase "rare thing" reaching
      back to 1 year 8 months 4 days 8 hours 30 minutes and 2 seconds
      note: when specifying duration, any datetime designator character can be
            omited (shown in the following two examples)
      note: months must be specified with uppercase M (distinction from minutes)
      note: minutes (m) are the default, so "m" can be omited

  logsene search -t 1h30m
      returns all the log entries from the last 1,5h

  logsene search -t 90
      equivalent to the previous example (default time unit is minute)

  logsene search -t 2015-06-20T20:48
      returns all the log entries that were logged after the provided datetime
      note: allowed formats listed at the bottom of this help message

  logsene search -t "2015-06-20 20:28"
      returns all the log entries that were logged after the provided datetime
      note: if a parameter contains spaces, it must be enclosed in quotes

  logsene search -t 2015-06-16T22:27:41/2015-06-18T22:27:41
      returns all the log entries between the two provided timestamps
      note: date range must either contain forward slash between datetimes,
            or a different range separator must be specified (next example)

  logsene search -t "2015-06-16T22:27:41 TO 2015-06-18T22:27:41" --sep " TO "
      same as previous command, except it sets the custom string separator that
      denotes a range
      note: default separator is the forward slash (as per ISO-8601)
      note: if a parameter contains spaces, it must be enclosed in quotes

  logsene search -t "last Friday at 13/last Friday at 13:30"
      it is also possible to use "human language" to designate datetime
      note: it may be used only in place of datetime. Expressing range is not
            possible (e.g. "last friday between 12 and 14" is not allowed)
      note: may yield unpredictable datetime values

  logsene search -q ERROR -s 20
      returns at most 20 log entries (within the last hour) with the term ERROR

  logsene search ERROR -s 50 -o 20
      returns chronologically sorted hits 21st to 71st (offset is 20)
      note: default sort order is ascending (latest entries at the bottom)

  logsene search --help
      outputs this usage information

Allowed datetime formats:
  YYYY[-]MM[-]DD(T, )[HH[:MM[:SS]]]
    YYYY-MM-DD HH:mm:ss
  note: date part may be separated from time by T (ISO-8601) or space
  note: if datetime contains a space, it must be enclosed in double quotes

Allowed duration format:
  note: uppercase M must be used for months, lowercase m for minutes
  note: if only a number is specified, it defaults to minutes

Allowed range formats
  range can be expressed in all datetime/duration combinations:
  note: / is default range separator; + or - sign is duration direction
  note: duration must begin with either + or - when used in end of range position

The following table shows how ranges are calculated, given the different input parameters

-t parameter range start range end
2016-06-24T18:42 timestamp now
2016-06-24T18:42/2016-06-24T18:52:30 timestamp timestamp
2016-06-24T18:42/+1d timestamp timestamp + duration
2016-06-24T18:42/-1d timestamp timestamp
2h30m8s now - duration now
2h/+1h now - duration1 start + duration2
2h/-1h now - duration1 - duration2 now - duration1
5d10h25/2016-06-24T18:42 now - duration timestamp

  note: all allowable datetime formats are also permitted when specifying ranges
  note: disallowed range separators:
       Y, y, M, D, d, H, h, m, S, s, -, +, P, p, T, t

Allowed "human" formats (all in local time):
    10 minutes ago
    yesterday at 12:30pm
    last night (night becomes 19:00)
    last month
    last friday at 2pm
    3 hours ago
    2 weeks ago at 17
    wednesday 2 weeks ago
    2 months ago
    last week saturday morning (morning becomes 06:00)
  note: "human" format can only be used instead of date-time
  note: it is not possible to express duration with "human" format (e.g. "from 2 to 3 this morining")
  note: it is recommended to avoid human format, as it may yield unexpected results

logsene config set

Usage: logsene config set [OPTIONS]
  where OPTIONS may be:
    --api-key <apiKey>
    --app-key <appKey>
    --default-size <size>
    --range-separator <sep>
    --trace <true|false>

It is not necessary to explicitly set api-key nor app-key.
Logsene CLI will ask you to log in and choose Logs App
if keys are missing from the configuration
  logsene config set --api-key 11111111-1111-1111-1111-111111111111
      sets the api key for the current session

  logsene config set --app-key 22222222-2222-2222-2222-222222222222
      sets Logs App key for the current session

  logsene config set --default-size 3000
      sets default number of hits returned for the current session (overrides the default 200)

  logsene config set --range-separator TO
      sets default separator of two datetimes for time ranges (default is /, as per ISO6801)

  logsene config set --trace [true]
      activates tracing for the current session (true can be omitted)

  logsene config set --trace false
      deactivates tracing for the current session

logsene config get

Usage: logsene config get [OPTION]  Where OPTION may be:
    --default-size (sets the default number of hits returned for the current session)
    --range-separator (used to separate start and end of a time range)
    --all (return listing of all params from the current user's session)