nl - the line numbering utility takes one or more file names on its command line. So nl * cats the contents of all the files with line numers.
46$ ls | wc
15 15 233
47$ nl * | wc
857 3540 29899
48$ ls | nl
1 Makefile
2 RCS
3 Tests
4
...
15
But you just want the count, not the list, so you would need to | tail -1 | cut -d' ' -f1.
Or to be precise: ls | nl | tr -s ' ' ' ' | tr "\t" ' ' | cut -d' ' -f2
--
TTTATCGGTCGTTATATAGATGTTTGCA
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