nl

A utility for numbering lines, either from a file, or from standard input.

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• Number non-blank lines in a file:

nl {file}

• Read from standard output:

cat {file} | nl {options} -

• Number only the lines with printable text:

nl -t {file}

• Number all lines including blank lines:

nl -b a {file}

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

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

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