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nl

number lines of files

References

  • man nl

Synopsis

nl [OPTION]... [FILE]...
  • Write each FILE to standard output, with line numbers added.
  • With no FILE, or when FILE is -, read standard input.

Options

By default, selects -v1 -i1 -l1 -sTAB -w6 -nrn -hn -bt -fn.

All Options

  • -b, --body-numbering=STYLE use STYLE for numbering body lines
  • -d, --section-delimiter=CC use CC for separating logical pages
  • -f, --footer-numbering=STYLE use STYLE for numbering footer lines
  • -h, --header-numbering=STYLE use STYLE for numbering header lines
  • -i, --line-increment=NUMBER line number increment at each line
  • -l, --join-blank-lines=NUMBER group of NUMBER empty lines counted as one
  • -n, --number-format=FORMAT insert line numbers according to FORMAT
  • -p, --no-renumber do not reset line numbers at logical pages
  • -s, --number-separator=STRING add STRING after (possible) line number
  • -v, --starting-line-number=NUMBER first line number on each logical page
  • -w, --number-width=NUMBER use NUMBER columns for line numbers

Style

  • a number all lines
  • t number only nonempty lines
  • n number no lines
  • pBRE number only lines that contain a match for the basic regular expression (BRE)

Format

  • ln left justified, no leading zeros
  • rn right justified, no leading zeros
  • rz right justified, leading zeros

Usage

Sample

$ cat input1
abhishek
divyam
chitransh
naveen
harsh

Default

$ nl input1
     1  abhishek
     2  divyam
     3  chitransh
     4  naveen
     5  harsh

Body Number

Style : number no lines -b n

$ nl -bn input1
       abhishek
       divyam
       chitransh
       naveen
       harsh

Number Increment

$ nl -i2 input1
     1  abhishek
     3  divyam
     5  chitransh
     7  naveen
     9  harsh

Number Separator

$ nl -s: input1
     1:abhishek
     2:divyam
     3:chitransh
     4:naveen
     5:harsh
$ nl -s': ' input1
     1: abhishek
     2: divyam
     3: chitransh
     4: naveen
     5: harsh

Number Width

$ nl -w1 input1
1       abhishek
2       divyam
3       chitransh
4       naveen
5       harsh

Number Format

$ nl -nln input1
1       abhishek
2       divyam
3       chitransh
4       naveen
5       harsh

$ nl -nrn input1
     1  abhishek
     2  divyam
     3  chitransh
     4  naveen
     5  harsh

$ nl -nrz input1
000001  abhishek
000002  divyam
000003  chitransh
000004  naveen
000005  harsh