Stats is designed to generate basic assembly statistics such as scaffold count, N50, L50, GC content, gap percent, etc. It can also generate per-sequence GC-content information. The reason for the existence of stats is to replace prior tools that had similar function, but could not scale to large metagenomes; Stats is capable of processing an assembly of practically unbounded size, with sequences of practically unbounded length. And it does this rapidly, in a small amount of memory. Stats can also estimate the memory requirements of BBMap for a given assembly and kmer length.
Stats uses 120MB of RAM regardless of the assembly size.
Stats is single threaded; it does not do garbage-collection or even use independent threads for I/O streams, unlike other BBTools.
To get stats on an assembly:
To compare multiple assemblies:
statswrapper.sh in=a.fa,b.fa,c.fa format=6
To print GC and length information per sequence:
stats.sh in=contigs.fa gc=gc.txt gcformat=4