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A small list of hot key combos..

Work under the console(!xterm)
shift-scrolllock
memory information
ctrl-scrolllock
process listing
shift-pageup/shift-pagedown
scroll through the terminal history
alt-(f1-f12)
switch consoles, note that the left alt is for tty1 through tty12 and the right is for tty13 through tty24
alt-(left|right)
switch between the previous and next terminals
alt-up
keyboard request, see inittab manpage
Sysrq
sysrq-(0-9)
set console log level
sysrq-b
emergency reboot
sysrq-e
kill all except init (SIGTERM)
sysrq-i
kill all except init (SIGKILL)
sysrq-k
kill all programs on current console
sysrq-l
kill all including init (lock the system)
sysrq-m
same as shift-scroll lock (memory info)
sysrq-o
apm poweroff
sysrq-p
show registers
sysrq-r
set keyboard to XLATE
sysrq-s
sync disks
sysrq-t
same as ctrl-scroll lock (process list)
sysrq-u
unmount all filesystems and change to readonly
Bash
TAB
attempt to complete filename or variable name
alt-@
attept to complete hostname, inorder for this to work the hostname must be listed in /etc/hosts
ctrl-d
logout, must be entered on a blank line.
ctrl-l
clear the screen
ctrl-r
search history, can be used repeatedy to find previous occurances
ctrl-t
transpose characters
alt-t
transpose words
General
shift-insert
paste contents of copy buffer
ctrl-a
move to the beginning of a line
ctrl-e
move to the end of a line
ctrl-u
delete from start of the line to the cursor
ctrl-l
delete from cursor to the end of the line
ctrl-c
delete word
ctrl-c
kill the currently running program
ctrl-z
suspend the current program, entering % in the shell ususally resumes this program