Add Column to csv osx

Question

Recently I've switched from windows to osx and I'm struggling to work out the best way to automate some tasks I used to use Windows Power Shell for.

In power shell I used to run a script to add & populate columns in a csv file

Import-Csv z:\myfile.csv | Select-Object @{Name='ACTION';Expression={''}},*,@{Name='COUNTRY';Expression={'UNITED KINGDOM'}} | Export-Csv z:\output.csv -NoTypeInformation

As you can see this adds 2 columns to the csv and populates Country with United Kingdom.

I also used to run this from a batch file which would create folders with the date & place the created files in before deleting the original file.

My question is what's the best / most efficient way to achieve this in osx?

I have looked and think it maybe awk, I have tried with automator but haven't had much success.

Thanks for any advice.

Answer 1

Assuming 1st line is header, if not remove heading 1!

sed '1!s/$/,,UNITED KINGDOM/' z:\myfile.csv > z:\output.csv

it add to end of each line, except 1st, the trailing ,,UNITED KINGDOM