It's not a big line, and it *may not* work for everybody, I guess it depends on the detail of access_log configuration in your httpd.conf. I use it as a prerotate command for logrotate in httpd section so it executes before access_log rotation, everyday at midnight.

Uses the dumb terminal option in gnuplot to plot a graph of frequencies. In this case, we are looking at a frequency analysis of words in all of the .c files.

require the pdftk package

This is a cool trick to view the contents of the file on /dev/pts/0 (or whatever terminal you're using), and also send the contents of that file to another program by way of an unnamed pipe. All the while, you've not bothered saving any extra data to disk, like you might be tempted to do with sed or grep to filter output.

bash neto..

Quick write some notes to a file with cat. Ctrl+C when you have finish.

This is a quick and easy way of encrypting files in a datastream, without ever really creating an output file from gpg. Useful with cron also, when file(s) have to be sent based on a set schedule.

Some malicious program appends a iframe or script tag to you web pages on some server, use this command to clean them in batch.

The sort utility is well used, but sometimes you want a little chaos. This will randomize the lines of a text file.

BTW, on OS X there is no

option! There is also no

These are only in the newer GNU core...

This is also faster than the alternate of:

If the connection works you should see a "hello" on host A. If not: check your cabeling etc :-)

cat -n file : number all line

cat -b file : number only non empty line

see man cat

uuencode the file to appear as an attachment

This just reads in a local file and sends it via email. Works with text or binary. *Requires* local mail server.

This helped me find a botnet that had made into my system. Of course, this is not a foolproof or guarantied way to find all of them or even most of them. But it helped me find it.

Using OpenSSL we can encrypt any input we wish and then use Netcat to create a socket which can be connected to from an externally source (even using a Web Browser)

This will diff your local version of the file with the latest version in svn. I put this in a shell function like so:

middlehost allows ssh access from where you are but not securehost.

Use nice ssh piping to simulate scp through A => B => C

setting up the shell function if left as an exercise for the reader. ;-)

Agent forwarding should avoid password typing.