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Apply the unweighted_unifrac and weighted_unifrac metrics (modify with -m) to all otu tables in rarefied_otu_tables (-i) and write the resulting output files to bdiv/ (-o, will be created if it doesn't exist). Use the rep_set.tre (-t) to compute phylogenetic diversity metrics. ALWAYS SPECIFY ABSOLUTE FILE PATHS (absolute path represented here as $PWD, but will generally look something like /home/ubuntu/my_analysis/).