A pager for tabular data
less, but for CSV and parquet files! It looks like this:
You can see tass's schema inference in action here. The fourth and fifth columns only contains a small number of unique values, so tass colour-codes them automatically. The columns to the right of those are numerical, so tass right-aligns them and shows negative values in red.
This demo shows data being piped into (an older version of) tass. You can also open files which are still being appeanded to, and new rows will appear as the file grows.
If you already have rust, you can install tass like this:
$ cargo install tass
You can pass a filename, or pipe data to stdin:
$ tass mydata.csv
$ cat mydata.csv | tass
|Move up one row, page
|Move down one row, page
|Move left one column
|Move right one column
|Move to start/end of file
|Move to line
|Move to end and auto-scroll as new rows come in
|Search, reverse-search for string
|Jump to next, previous match
Comparison to other tools
|Loads whole file into memory
|⭐ Viewing data, basic searching
|⭐ Similar to tass
|⭐⭐ Summary stats, plots, etc.
|CSV, parquet, JSON, ...
|⭐⭐⭐ It's a spreadsheet!
|CSV, xls, ods, ...
My advice is to use the most full-featured tool you can get away with. However, if you are cursed with multi-gigabyte CSV files, then your options are limited.
Tips & tricks
Here are some more tips for working with large CSV files:
- If you want to see summary statistics but don't care about the underlying data itself, you can still use VisiData/Excel/etc.: just downsample it first. This will reduce the precision of your stats and plots, but not the overall shape (probably). xsv has a subcommand that can do this for you.
- If you want exact answers to complex questions, consider dumping your CSV into a sqlite database and working with that instead.
- For ad-hoc computations on CSV files, take a look at frawk - it's really nice.