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UNIX v6源代码 这几乎是最经典的unix版本 unix操作系统设计和莱昂氏unix源代码分析都是用的该版

.sp 2
.H1
Summary of Commands and Line Numbers
.H2
.PG
The general form of
.ul
ed
commands is the command name,
perhaps preceded by one or two line numbers, and,
in the case of
.ul
e, r
and
.ul
w,
followed by a file name.
Only one command is allowed per line,
but a
.ul
p
command may follow any other command
(except for
.ul
e, r, w
and
.ul
q).
.sp
.ul
a (append)
Add lines to the buffer (at line dot, unless
a different line is specified). Appending continues until ``\*.''
is typed on a new line.
Dot is set to the last line appended.
.sp 4p
.ul
c (change)
Change the specified lines to the new text which follows.
.li
The new lines are terminated by a ``\*.''.
If no lines are specified,
replace line dot.
Dot is set to last line changed.
.sp 4p
.ul
d (delete)
Delete the lines specified.
If none are specified, delete line dot.
Dot is set to the first undeleted line,
unless ``$'' is deleted,
in which case dot is set to ``$''.
.sp 4p
.ul
e (edit)
Edit new file.
Any previous
contents of the buffer are thrown away,
so issue a
.ul
w
beforehand
if you want to save them.
.sp 4p
.ul
f (file)
Print remembered filename.
If a name follows
.ul
f
the remembered name will be set to it.
.sp 4p
.ul
g (global)
.ul
g/---/commands
will execute the commands on those lines that contain
``---'', which can be any context search expression.
.sp 4p
.ul
i (insert)
Insert lines before specified line (or dot)
.li
until a ``\*.'' is typed on a new line.
Dot is set to last line inserted.
.sp 4p
.ul
m (move)
Move lines specified to after the line
named after
.ul
m.
Dot is set to the last line moved.
.sp 4p
.ul
p (print)
Print specified lines.
If none specified, print
line dot.
A single line number is equivalent to
``line-number p''.
A single newline prints ``\*.+1'',
the next line.
.sp 4p
.ul
q (quit)
Exit from ed.
Wipes out all text in buffer!!
.sp 4p
.ul
r (read)
Read a file into buffer (at end unless specified
elsewhere.) Dot set to last line read.
.sp 4p
.ul
s (substitute)
.ul
s/string1/string2/
will
substitute the characters of
`string2' for `string1' in specified lines.
If no line is specified, make substitution in line dot.
Dot is set to last line in which a
substitution took place, which means that if no substitution took place, dot is not changed.
.ul
s
changes only the first occurrence of string1 on a line;
to change all of them, type a ``g'' after the final slash.
.sp 4p
.ul
v (exclude)
.ul
v/---/commands
executes ``commands'' on those lines that
.ul
do not
contain ``---''.
.sp 4p
.ul
w (write)
Write out buffer onto a file.
Dot is not changed.
.sp 4p
.ul
.li
.= (dot value)
Print value of dot.
(``='' by itself prints the value of ``$''.)
.sp 4p
.ul
! (temporary escape)
   Execute this line as a UNIX
command.
.sp 4p
.ul
/-----/
Context search.
Search for next line which contains
this string of characters.
Print it.
Dot is set to line where string
found.
Search starts at ``\*.+1'', wraps around from ``$'' to 1,
and continues to dot, if necessary.
.sp 4p
.ul
?-----?
Context search in reverse direction.
Start search
at ``\*.\(mi1'', scan to 1, wrap around to ``$''.
.in 0