1. Mac Csv File
2. Csv Splitter Mac

How to split large CSV files in Mac OS X Terminal, the easy way. And add an extension to them also, so Mac OS X knows how to handle them.

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How to split a large text file into parts of your choosing:

• by line number;
• or by file size (Kb or Mb);
• and add a '.csv' extension to all splitted files

First example: auto split a single CSV file into multiple files of 200 lines each

Let's say I have one .csv-file that I want to split into multiple files that contain a maximum of 200 lines. I can use the following command:

Where split_me.csv is the filename of the CSV file you wish to split into chunks of 200 lines. The split function itself is smart enough to give the new files a name, so no need to worry about that.

For many cases this alone is enough. But if you want some additional options, read on.

Example 2: split into files of 1MB each, and add a '.csv' extension to all of them

Let's make it more interesting:

• I want to split a file of 6.4MB into files of 1MB each,
• and I want each resulting file to also have the .csv extension.

For that, we need to alter the split command a little bit.

First we used the -l flag, which separated the files by a number of lines. Now we're going to use the -b flag, which separates by size (bytes). Splitting it in files of 1MB is easy, just use 1m.

And additionally, we'll use a little loop and the mv-command to change the extensions.

First: split into chunks of 1mb each:

And next, add the .csv extension to all of them:

Et voila! We can see the result:

Word of warning

You should know this, but just to make sure.

1. Open the Terminal in the right folder.
2. If you add the extensions with the command I provided, it will do this for ALL files in the folder. So make sure that files you do not want changed are outside of it
3. You can see in the image that all new files are 1Mb each (except the last one of course), and they have all gained an extra suffix / extension of .csv

What's next?

If you think this was useful to you, it might be for others also. Feel free to share:

Save yourself some time, and merge .csv files with one easy command in Terminal.

Let's say you have a bunch of .csv files in a folder. You want to merge them into one file. How to do that?

Easy: use 'cat'

Cat is a UNIX program that lets you concatenate files, which is what we need. It's so simple that you don't need installable apps for it. For those who want the code first and the explanation later, here is the code:

That's it.

Translated, it says: 'take all files in this folder that end with '.csv', and put them in 'merged.csv' (effectively merging them).

Bonus tip: the 'open here in Terminal' service in Mac OS X 10.7+

It is important that this command is executed in the right directory. You don't want all existing .csv files in your entire computer to be altered this way, now do you? :) You can use the terminal to navigate to the folder (as described below), but you can also use a default Mac OS X service that functions in much the same way as its counterpart in Windows: 'open here in Terminal'. It works like this.

First, go to: System Preferences > Keyboard > Shortcuts > Services and select New terminal at Folder:

From now on, when you select a folder in the Finder, you can right-click and find it under Services:

We want more images!

Here are some images that may help. I had a bunch of .csv files that contained exports of Google search engine results (made by the SEOmoz toolbar). The English results were all put in a folder named en inside the folder /meta/csv:

I also made sure that every single .csv only contained the data I needed. In my case, I needed to delete the first 7 rows that were included in every export:

Mac Csv File

Back to the terminal. I used cd to go to that folder in my terminal (or use the 'New terminal at Folder' Service I described earlier):

You can see it below, i'm at macbook en (the folder en on my macbook) and my username is monchito. I then executed the command:

The file merged.csv was successfully added to the folder:

A quick check shows that the newly created .csv file contains way more rows than the individual files, so it probably worked :p

Csv Splitter Mac

Now I can merge a great number of .csv files into one file quickly, and move on with my analysis.

What's next?

If you think this was useful to you, it might be for others also. Feel free to share: