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diff will usually only take one file from STDIN. This is a method to take the result of two streams and compare with diff. The example I use to compare two iTunes libraries but it is generally applicable.
diff is designed to compare two files. You can also compare directories. In this form, bash uses 'process substitution' in place of a file as an input to diff. Each input to diff can be filtered as you choose. I use find and egrep to select the files to compare.

Find out when your billion-second anniversary is (was).
This is the same command as this one, but for OS X. http://www.commandlinefu.com/commands/view/3053/find-out-when-your-billion-second-anniversary-is-was.

Both view and pipe the file without saving to disk
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.

Add "prefix" on a buch of files

Merge *.pdf files
Merge all pdf files in the directory into one pdf file (the out.pdf file)

Convert .flv to .3gp
Download YouTube videos as .flv and convert them to .3gp for your mobile phone.

IBM AIX: Extract a .tar.gz archive in one shot

List only directories, one per line
omit the 1 (one) if you don't need one-per-line

check open ports without netstat or lsof

syncronizing datas beetween two folder (A and B) excluding some directories in A (dir1 and dir2)


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