# Modifying a CSV file - Logstash

**URL:** <https://discuss.elastic.co/t/modifying-a-csv-file-logstash/246333>\
**Category:** Logstash\
**Created:** [August 25, 2020, 5:11pm UTC](https://discuss.elastic.co/t/modifying-a-csv-file-logstash/246333 "2020-08-25T17:11:18Z")\
**Posts on this page:** 5\
**Page:** 1

<div class="post-metadata">

**Author:** ![Aniket\_Valsangkar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/aniket_valsangkar/32/46158_2.png) [@Aniket\_Valsangkar](https://discuss.elastic.co/u/Aniket_Valsangkar)\
**Post date:** [August 25, 2020, 5:11pm UTC](https://discuss.elastic.co/t/modifying-a-csv-file-logstash/246333/1 "2020-08-25T17:11:18Z")

</div>

Hi Team,

I have a CSV file which gets updated (delete, add, change in the data in fields) regularly. The columns stay constant only the data changes. I want to write a code in logstash, which should be able to capture these changes withouht running the logstash command again and again. Basically, such changes should be tracked live.

I am very new to logstash (amateur) and have written the following code.

input {  
file {  
path =\> "C:/Aniket/route\_maps.csv"  
sincedb\_path =\> "NUL"  
type =\> "maps"  
start\_position =\> "beginning"  
#mode =\> "tail"  
#ignore\_older =\> 0

}  
}  
filter {  
csv {  
separator =\> ","  
columns =\> ["SrNo","NameofCountry","Cityname","PathID","PathOrder","FlowAmount","Latitude","Longitude"]  
skip\_header =\> "true"  
}

mutate {  
convert =\> {  
"Latitude" =\> "float"  
"Longitude" =\> "float"  
"SrNo" =\> "float"  
}

}  
if [SrNo] == 0.0 { drop {} }  
}  
output {

elasticsearch {  
hosts =\> "[http://localhost:9200](http://localhost:9200)"  
index =\> "route\_csv"  
action =\> "index"  
document\_id =\> "%{SrNo}"  
doc\_as\_upsert =\> true  
workers =\> 1  
}  
stdout { codec =\> rubydebug  
}  
}

THe output i am getting is not desirable, as the modification is not captured correclty

Can you please help?

THanks,

Aniket

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<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [August 25, 2020, 5:24pm UTC](https://discuss.elastic.co/t/modifying-a-csv-file-logstash/246333/2 "2020-08-25T17:24:07Z")

</div>

A file input is intended to tail log files that are being appended to, not to re-read files that are getting overwritten. You could try using an exec input to repeatedly type the file.

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<div class="post-metadata">

**Author:** ![Aniket\_Valsangkar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/aniket_valsangkar/32/46158_2.png) [@Aniket\_Valsangkar](https://discuss.elastic.co/u/Aniket_Valsangkar)\
**Post date:** [August 25, 2020, 5:33pm UTC](https://discuss.elastic.co/t/modifying-a-csv-file-logstash/246333/3 "2020-08-25T17:33:42Z")

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Even appending is not happening properly.

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<div class="post-metadata">

**Author:** ![Aniket\_Valsangkar](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/aniket_valsangkar/32/46158_2.png) [@Aniket\_Valsangkar](https://discuss.elastic.co/u/Aniket_Valsangkar)\
**Post date:** [August 27, 2020, 11:48am UTC](https://discuss.elastic.co/t/modifying-a-csv-file-logstash/246333/4 "2020-08-27T11:48:26Z")

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Hello Team, any one who can help me on this?? need it on an urgent basis.

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [September 24, 2020, 11:48am UTC](https://discuss.elastic.co/t/modifying-a-csv-file-logstash/246333/5 "2020-09-24T11:48:39Z")

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