SED PDA Reference Card
SED, A Stream-oriented Editor
[Condensed from:
sed & awk Pocket Reference
© 2000; by Arnold Robbins;
ISBN: 1-56592729-X ]
by Jesus Monroy, Jr.  (didgood.com)

NOTE: sed has two (2) internal buffers - "pattern space" (p-space) and "hold space" (h-space). 

Command-Line Syntax
sed [-n] [-e] 'command' file(s)
sed [-n] -f scriptfile file(s)

Syntax of Commands
general form:
[addr[,addr]][!] cmd [arg]

"addr" can be a line number, a symbol or a regular expression.

"cmd" - commands as listed below.

"arg" - apply only to certain commands (b, t, r, w & s).

multi-command form:
[/pattern/[,/pattern/]] [!]{
cmd1
cmd2
}

Examples
s/xx/yy/g
    subs. all lines (all occurrences)
/BSD/d
    delete lines containing BSD
/^BEGIN/,/^END/p
    print between BEGIN & END, incl.
/SAVE/!d
    delete lines without SAVE
/BEGIN/,/END/!s/xx/yy/g
    subs. all lines, except between

Group Summary

Basic editing
a\        append after line
c\        replace (usually block)
i\        insert before line
d        delete
s        substitution
y        translate chars (like tr)

Line information
=        line number
l        control chars (ASCII)
p        entire line(s) (or bound line)

Input/output processing
n        output current, get next
r        read another file to p-space
w        write to another file
q        quit now!

Yanking and putting
h        copy & overwrite h-space
H        copy & append h-space
g        get h-space & overwrite
G        get h-space & append
x        eXchange h-space & p-space

Branching commands
b        branch to label or end
t        substitute, then branch
:label    label to branch to

Multiline input processing
N        append next line to p-space
D        delete 1st part of p-space
P        print 1st part of p-space

Alphabetic Summary
#        comment, except #n
:        label to branch to
=        line number
a        append after line
b        branch to label or end
c        replace (usually block)
d        delete
D        delete 1st part of p-space
g        get h-space & overwrite
G        get h-space & append
h        copy & overwrite h-space
H        copy & append h-space
i        insert before line
l        control chars (ASCII)
n        output current, get next
N        append next line to p-space
p        entire line(s) (or bound line)
P        print 1st part of p-space
q        quit now!
r        read another file to p-space
s        substitution
t        substitute, then branch
w        write to another file
x        eXchange h-space & p-space