The csvtool is intended to convert the ArchiveRecord file format produced by tcp-info to more easily usable CSV files. csvtool currently only handles individual, raw or zstd compressed JSONL files as a source. Named files should be the only parameter. If reading uncompressed JSONL from STDIN, provide no argument.
Decompressing the JSONL file so that csvtool reads from stdin:
zstd -cd 2019/04/01/ndt-jdczh_1553815964_00000000000003E8.00184.jsonl.zst | ./csvtool > connection.csv
Directly read compressed format:
./csvtool 2019/04/01/ndt-jdczh_1553815964_00000000000003E8.00184.jsonl.zst > connection.csv