How to add text to the beginning of all files in a folder?

Question

I have a folder with 1,000 small text files in it, and I need to modify the files and add 7 zeroes to the beginning of every one. After I do this I'll be able to cat them all together. Is there an easy way to do this in terminal?

Accepted Answer

Find all files in the current directory and insert `0000000` at the beginning of the file using `sed`:

```
find . -maxdepth 1 -type f -exec sed -i.bk '1i \
0000000' {} \;
```

This will also create `.bk` file for each file in directory. If you are happy with the result just `rm *.bk` to delete the back up files.

How to add text to the beginning of all files in a folder?

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