find out all failed login attempts via ssh/telnet

how do I find out all failed login attempts via ssh/telnet?

# grep "authentication failure" /var/log/messages|awk '{ print $13 }' | cut -b7- | sort | uniq -c

find command with examples

find command all we know but here u find some example,

find . -name "rc.conf" -print
This command will search in the current directory and all sub directories for a file named rc.conf.

find /usr/src -not \( -name "*,v" -o -name ".*,v" \) '{}' \; -print
This command will search in the /usr/src directory and all sub directories. All files that are of the form '*,v' and '.*,v' are excluded. Important arguments to note are:

* -not means the negation of the expression that follows
* \( means the start of a complex expression.
* \) means the end of a complex expression.
* -o means a logical or of a complex expression.
In this case the complex expression is all files like '*,v' or '.*,v'

The above example is shows how to select all file that are not part of the RCS system. This is important when you want go through a source tree and modify all the source files... but ... you don't want to affect the RCS version control files.

find . -exec grep "www.athabasca" '{}' \; -print
This command will search in the current directory and all sub directories.

find . -exec grep -q "www.athabasca" '{}' \; -print

This command is very important for process a series of files that contain a specific string. You can then process each file appropriately. An example is find all html files with the string "www.athabascau.ca". You can then process the files with a sed script to change those occurrances of "www.athabascau.ca" with "intra.athabascau.ca"