1

I have quite a large csv file (call it file.csv). It looks like this one:

col1,col2,col3,...
1,2,3
1,2,5
...

So after doing something like this cat file.csv | grep "_some_pattern_" I receive only the output values. Is there a way to append the header (the first line) to the output?

It would be very convenient...

Rui F Ribeiro
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St.Antario
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1 Answers1

5

you can use head to print the first line and tail to search with grep starting after the header for the pattern.

head -n 1 file.csv && tail -n +2 file.csv | grep "some pattern"
ryanpattison
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  • If you want to dump the output into a single output file (e.g filter an CSV file)

    head -n 1 input.csv > output.csv && tail -n +2 input.csv | egrep -i "some pattern" >> output.csv

     – Jorge Mendes Feb 25 '21 at 07:39