Linux Split File (eg CSV) and Keep Header Row

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Linux has a great little utility called split, which can take a file and split it into chunks of whatever size you want, eg 100 line chunks.

However, for CSV files etc, each chunk generally needs to have the header row in there. Unfortunately the split command doesn’t have an option for that. However with a little bit more code you can achieve it.

tail -n +2 file.txt | split -l 4 - split_
for file in split_*
    head -n 1 file.txt > tmp_file
    cat $file >> tmp_file
    mv -f tmp_file $file