Keyboard shortcut for special characters

http://www.nouilles.info/keyboard_shortcuts.html

Shortcut to show desktop on Mac OS X Lion

Ctrl + ↓

Del key on MacBook PRO

On Macbook pro, the “delete” is actually backspace. To delete, you need Fn + delete

HEX mode in VIM

• Enter hex edit mode:

  %!xxd

• Exit hex edit mode:

  %!xxd -r

Multiples of bytes

Multiples of bytes
SI decimal prefixes		IEC binary prefixes
Name (Symbol)	Value	Name (Symbol)	Value
kilobyte (kB)	103	kibibyte (KiB)	210 = 1.024 × 103
megabyte (MB)	106	mebibyte (MiB)	220 ≈ 1.049 × 106
gigabyte (GB)	109	gibibyte (GiB)	230 ≈ 1.074 × 109
terabyte (TB)	1012	tebibyte (TiB)	240 ≈ 1.100 × 1012
petabyte (PB)	1015	pebibyte (PiB)	250 ≈ 1.126 × 1015
exabyte (EB)	1018	exbibyte (EiB)	260 ≈ 1.153 × 1018
zettabyte (ZB)	1021	zebibyte (ZiB)	270 ≈ 1.181 × 1021
yottabyte (YB)	1024	yobibyte (YiB)	280 ≈ 1.209 × 1024

DATE and TIME in TCL script using clock

TCL: clock command