NL(1) NL(1) nl - number lines of files nl []... []... , . , -, . . -b, --body-numbering= -d, --section-delimiter= -f, --footer-numbering= -h, --header-numbering= -i, --line-increment= -l, --join-blank-lines= -n, --number-format= -p, --no-renumber -s, --number-separator= () -v, --starting-line-number= -w, --number-width= --help --version : -bt -d'\:' -fn -hn -i1 -l1 -n'rn' -s -v1 -w6 CC are two delimiter characters used to construct logical page delimiters; a missing second character implies ':'. As a GNU extension one can specify more than two characters, and also specifying the empty string (-d ") disables section matching. : a t n pBRE , ,,BRE" : ln , rn , rz , . coreutils: Copyright (C) 2023 Free Software Foundation, Inc. 3+: 3 . : . , . ,,info '(coreutils) nl invocation'" ; 3 . . , - TODO <>. coreutils 9.4 2024 NL(1)