Easily Add Line Numbers to a Text File with the Command Line

Easily Add Line Numbers to a Text File with the Command Line Tutorial and Steps

So here we discuss the Easily Add Line Numbers to a Text File with the Command Line, and after a lot of requests from our users here is a guide about Easily Add Line Numbers to a Text File with the Command Line.

Brian asks, “I need to add line numbers to a text file. I don’t mean the line numbers in the text editor, I mean adding a number next to each item in a text file. Is this possible to automate or do I have to manually edit the file typing 1, 2, 3 and go crazy? “

Yes, you can easily encode line numbers in a text file … we’ll show you exactly how to do it! To be clear, what this is going to do is add a counting line number to the left of each new line of text, with each line preceded by the appropriate corresponding number. This hardcodes it into the text file, which means it’s different from simply showing line numbers in an app like TextWrangler, VIM or BBEdit.

To get started, go to the Terminal and you’ll want to do the following at the command line prompt:

Use cat to add line numbers to a text file

This is by far the easiest method: cat -n file> file_new

Just replace “file” with the file name you want to add line numbers to, and change “file name” to the exported name.

You can also use the command ‘nl’ as described below:

Numbers with hard core rules in a text file with the command nl

Replace “filename” and “filenamenumbered” again with the correct name of the file to which you are adding line numbers:

nl -ba -s ‘:’ filename> filenummed

That’s all there is to it! You can use both trick. Several readers agreed with the comments to provide easier solutions for numbering lines in a text file. They were listed above in order of simplicity, but we’ll also provide an ‘awk’ solution below.

mac terminal You can also use the ‘awk’ command line utility, but it’s a bit more complicated than the methods mentioned above, if you’re interested launch the Terminal and let’s go.

Take care of it first back upup of your text file in the strange case, something goes wrong (such as a syntax error). Now that you backup of the text file in question, we are going to write line numbers directly into it:

awk ‘{printf (“% 5d:% sn”, NR, $ 0)}’ filename> filenumber

filename is the original file, and filenummed is what you want to call the output of the awk command with associated line numbers. Your output text document now has a number followed by a colon for each line item:

1: line with words 2: line with words 3: line with words

Your original text file should be unaltered, but if you made a syntax error, the created backup file will save your day. This command works in any Unix operating system that has tricky support, so feel free to run this command in FreeBSD, Linux, Mac OS X, or any other variant you can think of.

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Easily Add Line Numbers to a Text File with the Command Line: advantage and disadvantage



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Easily Add Line Numbers to a Text File with the Command Line: FAQ

Tutorial Summary: Easily Add Line Numbers to a Text File with the Command Line

In this guide, we told you about Easily Add Line Numbers to a Text File with the Command Line; please read all steps so that you understand Easily Add Line Numbers to a Text File with the Command Line in case if you need any assistance from us, then contact us.

How this tutorial helping you?

So in this guide, we discuss the Easily Add Line Numbers to a Text File with the Command Line, which undoubtedly helps you.

What is actual time in which this method complete?

The time to complete the Easily Add Line Numbers to a Text File with the Command Line tutorial is 10+ minutes.

What are the supported Device?

Apple

What are the supported Operating system?

mac OS


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