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A utility for numbering lines, either from a file, or from stdin. More information:

  • Number non-blank lines in a file:

nl {{path/to/file}}

  • Read from stdout:

cat {{path/to/file}} | nl {{options}} -

  • Number only the lines with printable text:

nl -t {{path/to/file}}

  • Number all lines including blank lines:

nl -b a {{path/to/file}}

  • Number only the body lines that match a basic regular expression (BRE) pattern:

nl -b p'FooBar[0-9]' {{path/to/file}}