Use the Unix cat command to add line numbers to text

Sometimes you need to add line numbers to the text, which you can do with the Unix cat command. The use of the

Cat command is as follows:
 name
          cat-concatenate, Copy, and print files
 synopsis
          cat [-BENRSTUV] File ...
Options
      Cat recognizes the following options:
           -b   Omit Line numbers to blank lines when-n option is
  & nbsp;             specified. If This option is specified, the-n the option is
                 automatically selected.

-e Print A $ character at the "End of" (prior to the
New-line). If This option is specified, the-v option is
Automatically selected.

-N Display output lines preceded by line numbers, numbered
Sequentially from 1.

          -r   Replace multiple consecutive empty Lines with one empty
                 Line, so this there is never more than one empty line
         &nb sp;      between lines containing characters.

          -s   Silent option.  cat Suppresses Error messages about non-
                 Existent files, identical input and output, and write
                 errors.  Normally, input and output files cannot have
   & nbsp;            identical names unless the file is a special File.

          -t   Print each tab character as ^i and Form feed character as
                 ^l.  If This option is specified, the-v the option is
                 automatically selected.

-U does not buffer output (handle character-by-character).
Normally, output is buffered.

Cat-n can add line numbers, Cat-b can also add line numbers, but empty lines are ignored.
If the following command can add blank lines for File1, enter as File2 (blank line plus line number): Cat-n file1 > File2

If the following command can add blank lines for File1, enter as File2 (no line number for blank lines): Cat-b file1 > File2