Bash script - mass modify files sed regular expression

I have a set of .csv files (all in one folder) with the format shown below:

... (a lot more rows) ...

The thing is I screwed up a bit and it should look like this


In case the difference is too subtle to notice:

I need to write a script that changes every third and fifth semicolon into a period in every row in efery file in that folder.

My research indicate that I have to devise some clever sed s/ command in my script. The problem is I'm not very good with regular expressions. From reading the tutorial it's probably gonna involve something with /3 and /5.


Here's a really short way to do it:

sed 's/;/./3;s/;/./4' -iBAK *

It replaces the 3rd and then the 5th (which is now the 4th) instances of the ; with ..

I tested it on your sample (saved as sample.txt):

$ sed 's/;/./3;s/;/./4' <sample.txt

For safety, I have made my example back up your originals as <WHATEVER>.BAK. To prevent this, change -iBAK to -i.

This script may not be totally portable but I've tested it on Mac 10.8 with BSD sed (no idea what version) and Linux with sed (gsed) 4.1.4 (2003). @JonathanLeffler notes that it's standard POSIX sed as of 2008. I also just found it and like it a lot.

Golf tip: If you run the command from bash, you can use brace expansion to achieve a supremely short version:

sed -es/\;/./{3,4} -i *

Need Your Help

Can't get “Sign In” link to work in Hartl's Rails Tutorial. Getting: No route matches “/signin_path”


As the title says, I'm getting an the following error when clicking the "sign in" link when running my localhost app: No route matches [GET] "/signin_path"

Deserialize Json Object - DateTime

c# wpf web-services microsoft-metro

My web-api returns an User Object. In that object there is a DateTime property. When i'am reading it in my Application i get an error because the string that would represent the DateTime isn't vali...

About UNIX Resources Network

Original, collect and organize Developers related documents, information and materials, contains jQuery, Html, CSS, MySQL, .NET, ASP.NET, SQL, objective-c, iPhone, Ruby on Rails, C, SQL Server, Ruby, Arrays, Regex, ASP.NET MVC, WPF, XML, Ajax, DataBase, and so on.