Linux/Unix Search and Replace Text from Multiple Files

In Linux/Unix, for newbie to do search text from multiple files/folder look like difficult, replacing string from file sound even harder. It’s actually not hard or complicated to search and replace text from multiple files in Unix/Linux. The key is what command to use, there will be two main commands involve in search and replace, which are find and sed

For example I am hosting multiple web applications, the development might have several pg_connect command to connect database, in the event I am migrating database to other IP address, it might be hard for them to dig the file and replace the IP Address with new IP Addresses.

In Linux/Unix, you can search through the directories, looking for the files and replace it with the new IP address. Here is the sample.

The command above will search for files in the directory.
find -type f mean look for File only.
find -exec is to execute something from returned results.
sed -i means backup the files, in case you would like to restore later.
sed -e “s/host=x.x.x.x/host=y.y.y.y/g” is to replace x.x.x.x to y.y.y.y

You have backup files name filename.php.backup20100714, now what you need to do is move the files in a backup directory.

You might want to explore on find command, it can do a lot of cool stuffs.