Swiss File Knife - SFK makes daily tasks with Windows Command line easy. It covers such a huge range of tasks that it's hard to list them all here.

Amongst many other things, it can find and extract text in binary files, list dir tree sizes, filter and replace text, run an instant ftp server, find duplicate files, join many text files into one, create and verify md5 checksum lists and of course, run a command on all files. It can also detab text, create hexdumps from files, trace contents of a tcp connection, find dependencies between files, print colored text to terminals, locate commands in path, print last lines of a file, hex to binary, binary to source code, convert CR/LF, split and join large files. So how does this help you in your daily life. Well, if you want to transfer files from one PC to another for example, Swiss File Knife allows you to simply type "sfk ftpserv", and you have an ftp server running within one second. The same goes for many other functions: "sfk find" finds text within files - without long and boring index creations. "sfk run" runs your self-defined command on all files, but you get a preview of what would be done before the stuff is really executed.

No installation, registry modifications or DLL dependencies - SFK simply runs instantly, anywhere and is a great command line tool.