nl: add more information link (#5586)
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# nl
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# nl
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> A utility for numbering lines, either from a file, or from standard input.
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> A utility for numbering lines, either from a file, or from standard input.
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> More information: <https://www.gnu.org/software/coreutils/manual/html_node/nl-invocation.html>.
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- Number non-blank lines in a file:
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- Number non-blank lines in a file:
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