Select a subset of columns to sort. See 'qsv select --help' for the format details.

Compare according to string numerical value.

Reverse order.

Random order.

Random number generator seed to use if --random is set.

Compare strings disregarding case.

When set, identical consecutive lines will be dropped to keep only one line per sorted value.

When set, the sort will be faster. This is done by using a faster sorting algorithm that is not stable (i.e. the order of identical values is not guaranteed to be preserved). It has the added side benefit that the sort will also be in-place (i.e. does not allocate), which is useful for sorting large files that will otherwise NOT fit in memory using the default allocating stable sort. For --random sorts, this means using an alternative random number generator (RNG) that uses the much faster Wyrand algorithm instead of the ChaCha algorithm used by the standard RNG.

When set, the first row will not be interpreted as headers. Otherwise, the first row will always appear as the header row in the output.

The field delimiter for reading CSV data. Must be a single character.

Check if there is enough memory to load the entire CSV into memory using CONSERVATIVE heuristics.