From wiki.titan2x.com

rdiff

#   OLD is some large binary file
#   NEW is OLD with some changes
#   serious network bandwidth saving is possible by transferring only the delta
#
rdiff signature OLD OLD.signature
rdiff delta OLD.sig NEW NEW.delta
md5sum NEW > NEW.md5
rdiff patch OLD NEW.delta PATCHED
md5sum PATCHED > PATCHED.md5
cmp NEW.md5 PATCHED.md5

Compression

• filtering:
  • lzop: very fast but compresses little
  • lzma: can compress 4 times more than gzip (at the price of speed)

• non-filtering:
  • rzip: can compress more and faster than gzip, with options can compress much more but slower
  • 7za: can compress as much as lzma, slightly faster

See this Linux Journal article for more detailed comparison.

Other

Commands that look useful but didn't have time to check.

ntop

top for network monitoring. It seems to need a database and webserver as the front-end though.

ClusterSSH (cssh)

multiple ssh windows and one master window

k9copy

copy of one or more titles from a DVD9 to a DVD5, in the same way than DVDShrink for Microsoft Windows (R).

mp3wrap, mp3merge

concatenate mp3 files without loss of quality

xclip

access the X Window System Clipboard from the command line

lspci | xclip
xclip -o

wmctrl

control windows (position, size, stickiness, etc)

tellico

desktop database software

corkscrew

Tunnel TCP connections through HTTP proxies

xtermcontrol

dynamic configuration of xterm properties, for example:

    ssh() {
           xtermcontrol --fg "MediumSeaGreen"
           command ssh "$@"
           xtermcontrol --fg grey90
    }

pstree

view processes structured in a tree