Pak transfers multiple, possibly very big, regular files between possibly different hosts you have shell access to. It transmits segment IDs instead of file names and uses on-the-fly Blowfish-CBC encryption while being absolutely restartable with practically no loss of data already transmitted. Encrypted pak streams can be stored in intermediary regular files on untrusted hosts. Several stored pak streams, even truncated ones, can be merged for re-piping without decryption. Integrity is never checked. File offsets of any magnitude are supported via recompilation (the default width is 64 bits). Either UNIX 95 or UNIX 98 conformance is required and sufficient.
zap is a Perl wrapper for rm, meant be to used by the root account. It checks the list of files passed as arguments against a configuration file to make sure that root doesn't accidentally delete a protected file/directory. The root account(s) should make this script an alias for rm in their .bashrc file.
zmeter is a serial interface for the RadioShack 22-812 digital multimeter. It listens to the specified serial port and prints the meter reading on standard output (stdout). It operates by waiting for data from the digital multimeter to appear on the serial port and then passing that data to a child process to be formatted and output. It was derived from slsnif with most of the interesting features cut out and a small amount of original code added to support the 22812 data format.