GUI
Install searchmonkey
, it's available from the repositories.
It's easy enough, but if you still need some help with it, ask me and I'll see if I can figure it out for you.
Command Line
grep -R -i -a -n needle stack
grep
is the tool needed to find text.
-R
tells grep
to search recursively.
-i
tells grep
to not be case-sensitive.
-a
tells grep
to treat binary files as plain text files.
-n
tells grep
to show you the line number where the needle is in the file.
needle is the piece of text you are looking for.
stack is where it should search. Because of the -R
parameter you can use a directory here.
Example
grep -R -i -a -n "<html>" Websites
This will search for the text in every file in the folder Websites
I hope my explanation was enough for you to understand the use of all parameters. If not, feel free to ask more in a comment.