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how to get mongodb current featureCompatibilityVersion into a variable with only version

instead of printing like this

db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } )
{ "featureCompatibilityVersion" : { "version" : "4.0" }, "ok" : 1 }

Assign only version to a variable using mongo shell

fcv_version=$(eval "mongo <connection paramaeter> --eval '<oneliner to get fcv version>')
echo $fcv_version
4.0
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2 Answers 2

Reset to default
1

Use

fcv_version=$(eval "mongo <connection paramaeter> --quiet --eval 'db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } ).featureCompatibilityVersion.version')
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2
  • Your answer will include "Shell version and connection string" and not only version... So this is not requested answer.
    – JJussi
    Apr 15 at 7:15
  • @JJussi, correct I added --quiet option
    – Wernfried Domscheit
    Apr 15 at 10:53
2

Put that answer to variable and then read only wanted value:

cont:PRIMARY> var h=db.adminCommand( { getParameter: 1, featureCompatibilityVersion: 1 } )
cont:PRIMARY> h.featureCompatibilityVersion.version
4.4

At your requested form:

[mongodb_node ~]$ m_ver=$(mongo --quiet --eval 'db.adminCommand({ getParameter: 1, featureCompatibilityVersion: 1 }).featureCompatibilityVersion.version')
[mongodb_node ~]$ echo $m_ver
4.4
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  • thanks, can we get this in one line ? because I would like assign to variable when ran from mongo shell. something like - fcv_version=$(eval "mongo <connection paramaeter> --eval '<oneliner to get fcv version>')
    – unknown
    Apr 14 at 2:28
  • 1
    That other answer didn't remember to put --quiet and that will generate extra stuff to the answer... If you didn't notice!
    – JJussi
    Apr 15 at 7:12

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