What it does

This tool selects N random lines from a file, with no repeats, and preserving ordering.

---

Example

Input File:

chr7  56632  56652   D17003_CTCF_R6  310  +
chr7  56736  56756   D17003_CTCF_R7  354  +
chr7  56761  56781   D17003_CTCF_R4  220  +
chr7  56772  56792   D17003_CTCF_R7  372  +
chr7  56775  56795   D17003_CTCF_R4  207  +

Selecting 2 random lines might return this:

chr7  56736  56756   D17003_CTCF_R7  354  +
chr7  56775  56795   D17003_CTCF_R4  207  +