1. Name nl [man page] - number lines of files 2. Synopsis nl [OPTION]... [FILE]... 3. Frequently used options -b, --body-numbering=STYLE use STYLE for numbering body lines -f, --footer-numbering=STYLE use STYLE for numbering footer lines -h, --header-numbering=STYLE use STYLE for numbering header lines 4. Examples $ echo -e "one\ntwo\nthree\nfour\nfive\n\nsix" > file  $ nl file
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