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As you know, the CAT command prints the lines of the file to the screen in the ASCII format. This is one of the command that is used to view the content of the file without opening the file in an editor. Suppose if you want the lines of the files to be displayed on the screen with line numbers, you can use the below options.
1) CAT command:
From man page of CAT(1):
-n, --number
number all output lines
So,
$ cat -n file.txt | less
will print the line number in-front of each line.
2) LESS command:
The CAT command displays all the content in a single go. But the LESS command displays the content of the file page by page. You can use the below options to use view the content of the file using LESS command.
Press the [space-bar] if you want to see another page, and type [q] if you want to quit reading.
From man page of LESS(1):
-N or --LINE-NUMBERS
Causes a line number to be displayed at the beginning of each line in the display.
So,
$ less -N file.txt
will display the lines along with the line numbers.
3) you can set the less command to print the lines with line numbers by default using the below command.
$ export LESS='-RS#3NM~g'
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