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Linux - How to only keep X data

Firstly to start this you need to convert your .csv into a .txt

mv filename.csv  filename.txt

If you only wanted to keep fields that contain the word "dogs" or "cats" then you would run the following. $1 represents the field number

< filename.txt awk 'BEGIN {FS=","} tolower($1~/dogs|cats/' > newfilename.txt

If you also want to keep X data in either of the first or second columns you can run this command (replace smith and john with your keywords)
< filename.txt awk 'BEGIN {FS="\",\""} tolower($1~/smith|john/||$2~/smith|john/' > newfilename.txt

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