[unix-history] / usr / lib / learn / editor / L13.1a

#print
Remember we said that you didn't have to know the
number of the last line, because '$' could
always be used for that.  What if you want to know
how long the file is?  Well, the editor command
  $=
will tell you what '$' is set to, i.e. the number of
lines in the file.  You can find the number of lines in
any file, then, by editing it and then typing "$=".
(You then must leave the editor with the usual w,q).
How many lines are there in file 'henry'?  You may want to check
by listing the file with "cat" as well as by using "$="
in the editor.  Don't forget to leave the editor with
the usual 'w', 'q'; eventually, type "answer N"
where N is the number of lines.
#create henry
Murray Hill
Holmdel
Whippany
Madison
Piscataway
Chester
Warren
#copyin
#pipe
#user
#unpipe
#uncopyin
#match 7
#log
#next
14.1a  10
Commit	Line	Data
fed84c9b TL	1	#print
	2	Remember we said that you didn't have to know the
	3	number of the last line, because '$' could
	4	always be used for that. What if you want to know
	5	how long the file is? Well, the editor command
	6	$=
	7	will tell you what '$' is set to, i.e. the number of
	8	lines in the file. You can find the number of lines in
	9	any file, then, by editing it and then typing "$=".
	10	(You then must leave the editor with the usual w,q).
	11	How many lines are there in file 'henry'? You may want to check
	12	by listing the file with "cat" as well as by using "$="
	13	in the editor. Don't forget to leave the editor with
	14	the usual 'w', 'q'; eventually, type "answer N"
	15	where N is the number of lines.
	16	#create henry
	17	Murray Hill
	18	Holmdel
	19	Whippany
	20	Madison
	21	Piscataway
	22	Chester
	23	Warren
	24	#copyin
	25	#pipe
	26	#user
	27	#unpipe
	28	#uncopyin
	29	#match 7
	30	#log
	31	#next
	32	14.1a 10