Searching file for pattern, output to file (BASH)

Shell Programming and Scripting
1

Hello,
I'm trying to write a script in Bash to assist in pentesting. Essentially I'm looking to use a script to search for some terms in a log file and then send that key information into another file.

The log files consist of HTTP and SSL information that someone creates while browsing and logging into a website. But the login information gets buried underneath all of the HTTP information.

The output for the passwords vary such as this:

&pass=password123

&passwd=password123

However the username can be found easily by using a search for %40 because all usernames that are email's show up in the log like this:

testusername%40gmail.com

Is there anyway I can take the whole line where one of the above examples show up and print that into a file?

Thanks

EDIT: (This is what I have so far, I forgot to put it in with the original post)

read -p "What file are you searching? " fname
read -p "What are you looking for? " pattern
if [ -f "$fname" ]
then
    result=$(grep -i "$pattern" "$fname")
    echo "$result"
fi
2

So what are you trying to extract from the logfile...the username and password information.

3

Exactly but I'm looking to take the whole line where the username and password is found in the log file and output it to another file. I want the whole line because it tells me what site the username and password correlates to.

I might also want the line above the line containing the usename and password as well.

Here's an example of a line in the log file that has the username and password:

.tries=1&.src=fpctx&.md5=&.hash=&.js=&.last=&promo=&.intl=us&.lang=en-US&.bypass=&.partner=&.u=ce680od7o8okp&.v=0&.challenge=3FqbyPI8_gfTw7vxeai_eaIuZlwU&.yplus=&.emailCode=&pkg=&stepid=&.ev=&hasMsgr=0&.chkP=Y&.done=http%3A%2F%2Fwww.yahoo.com%2F&.pd=fpctx_ver%3D0%26c%3D%26ivt%3D%26sg%3D&.ws=1&.cp=0&nr=0&pad=5&aad=5&login=testusername%40gmail.com&passwd=password123&.save=&passwd_raw=

The line above that included with the line containing the username and password looks like this:

2012-04-10 12:41:19,033 POST Data (login.yahoo.com):
.tries=1&.src=fpctx&.md5=&.hash=&.js=&.last=&promo=&.intl=us&.lang=en-US&.bypass=&.partner=&.u=ce680od7o8okp&.v=0&.challenge=3FqbyPI8_gfTw7vxeai_eaIuZlwU&.yplus=&.emailCode=&pkg=&stepid=&.ev=&hasMsgr=0&.chkP=Y&.done=http%3A%2F%2Fwww.yahoo.com%2F&.pd=fpctx_ver%3D0%26c%3D%26ivt%3D%26sg%3D&.ws=1&.cp=0&nr=0&pad=5&aad=5&login=testusername%40gmail.com&passwd=password123&.save=&passwd_raw=