Re: [9fans] Sam questions

["rob pike" <rob@plan9.bell-labs.com>]

0,$x/old\.com/c/new.com/
1,$x/old\.com/c/new.com/
,x/old\.com/c/new.com/

All mean the same thing.  0 is the null string at the beginning
of the file.  1 is the first line, which of course starts at the null
string at the beginning of the file.  Old ed users still think the file
starts at line 1, but it really starts at 0.  The final example uses
sam's defaults to type less: the address , defaults left side to 0
and right side to $.  Other examples are ., to go from here to
the end, ,. to go from the beginning to here, etc.

Speaking of defaults, don't leave a space after the x because
that invokes another default:
	,x/asdf/
breaks the file into asdfs but
	,x /asdf/
is a shorthand for
	,x/.*\n/ /asdf
which isn't what you probably mean.  That does make it easy to
find lines that match a pattern though:
	,x g/pattern
(defaulting the trailing / and the command p).

-rob