Grep Command Experssion
 

:: Get host
grep -Eao 'rtmp.{40}' plugin-container.dmp | sort -u

What is the . for? Also, what do you think the {40} accomplishes?

I don't need help with the | sort -u part. I know what it is for.

You may be missing a coma(,) between 4 and 0.

If coma is there it will grep rtmp.4, rtmp.0 from plugin-container.dmp

Not missing comma
 

I've seen the same code line in different places around the web and the line is the same - no comma.

Here's where I got this line of code from: http://svnpenn.blogspot.com/2011/07/...osts-file.html

Anybody else know what the rtmp.{40} bit does?

. - any character
{40} - 40 of the previous character

40 periods
 

That would mean that the server name path would contain 40 periods. This doesn't make any sense...

Do we have anymore experienced people?

Sure---but do you think that's going to change the answer?

You are using grep -E, which means that the regex is using the "extended" syntax. In that syntax, "{x}" means "x occurences of the previous regex". "." means "any character".

SO....."rtmp.{40}" means "rtmp, followed by any 40 characters (including spaces)"

Who said it meant 40 periods?

I don't think so.....

wild characters
 

For some reason I overlooked that the other poster said that "." means any character. I'm used to using * or ? as the only wild characters. This is the first time I see a period used as a wild character. I guess I'm a bit rusty...

So now I see that what he wants is "rtmp" plus "://" and then the rest of the host address.

The difference is that wildcards used the way you mentioned are for globbing in the shell (on the command line), however the example you are using here is a regular expression and hence
quite a different beast. If you search for regular expression or regex you will find a slew of information.