Search and Replace file

I have some 50+ conf files that I am working. I need to find and replace various variable for all these files. For example, I'd like to find the line

Amplitude = 100; and replace it to: Amplitude = 200; for all files.

I've searched in online and found the solution only for one file. I'm looking for a way to do that in matlab. Any ideas?

Answer 1

[Jonathon Gibson]

If you're on a Unix system, and currently in the directory with the conf files, you can run from MATLAB:

!sed -i 's/Amplitude = 100;/Amplitude = 200;/g' ./*

Which will check every file in the current directory (./*) for the first regular expression (Amplitude = 100;) and replace it with the second regular expression (Amplitude = 200;). The ! just makes it the same as entering the command directly into the system's terminal.

[Namira]

Thanks. I am using Linux. It does not work in Linux system.

[Walter Roberson]

!sed -i 's/Amplitude = 100;/Amplitude = 200;/g' ./*

[Namira]

Thanks. I run the command in the command window in Matlab. It does not change the text. Did I do anything wrong?

[Walter Roberson]

sed is sensitive to spacing and upper/lower case. For example if there were two spaces between the = and the 100, then the above command would not match. The version that is not sensitive to spacing is

!sed -i 's/Amplitude\s*=\s*100;/Amplitude = 200;/g' ./*

[Namira]

Thank you so much. It's working now.