/pattern/= 
	write out the line number of line containing pattern

[address1][,address2]l
	list the selected lines showing non-printing characters as ASCII codes.

[address1][,address2]p
	print the selected lines. If "-n" flag has not been set then
	you will see two copies.

------------------------------------------------------------------------
[address1][,address2]n
	Output pattern space.
	Read next line into pattern space.
	Control passes to the next command.

[address1][,address2]d
	Read in selected line. 
	Delete pattern space. No output.
	A new line is read.
	PROCESSING BEGINS WITH THE FIRST COMMAND OF THE SCRIPT.

[address1][,address2]s/pattern/replacement/[flags]
	Substitute "replacement" for "pattern" on each selected line.
	If pattern addresses are used then "//" represents the last
	pattern address.
	n ... replace the "n"th instance (default is 1)
	g ... replace all instances
	p ... print the pattern space only if substitution is successful
	w FILENAME (write line to FILENAME; see below)

------------------------------------------------------------------------
[address]a\
	text\
	text

	Append "text" after (below) the address. The last line of "text" 
	has no "\" "text" not available for proecssing.

[address]i\
	text\
	text
	Insert "text" before (above) the address. The last line of "text" 
        has no "\" "text" not available for proecssing.

[address1][,address2]c\
	text\
	text
	Replace the selected lines by "text". The last line of "text"
        has no "\" "text" not available for proecssing.

[address]r FILENAME
	Read contents of FILENAME and append after the contents of the
	pattern space. These new contents cannot be edited.
	Exactly one blank space between "r" and FILENAME.
	
[address]w FILENAME 
	Append contents of pattern space to FILENAME. This action happens
	as soon as the command is encountered. 
	Exactly one blank space between "r" and FILENAME.


------------------------------------------------------------------------
[address]q
	On encountering address: finish all processing, output the
	pattern space and then quit.
	
:label	upto 7-characters for label 

[address1][,address2]b[label]
	Skip unconditionally to label

[address1][,address2]t [label]
	skip to label if previous substitution was successful.

------------------------------------------------------------------------
MULTI-LINE:

In addition to pattern space there is a "hold space".

[address1][,address2]h
	copy pattern to hold space.
[address1][,address2]H
	append pattern space to hold space (with an EOF separator)
[address1][,address2]g
	replace pattern space with hold space
[address1][,address2]G
	append to pattern space the hold space (with an EOF separator)
[address1][,address2]D
	Delete first part of pattern space (to EOF)
	CONTROL GOES TO THE TOP OF THE SCRIPT
[address1][,address2]P
	Print first part of pattern space (to EOF)
[address1][,address2]
	Swap pattern space and hold space


The EOF can searched by looking for "\n".