[unix-history] / usr / lib / learn / editor / L8.2a

#print
You can give addresses involving simple arithmetic
to move around in the file.  For example, 
  3+1p
is the same as
  4p
in the editor.  Now that's not interesting, but
if the current line (".") is line 3, then
  .+1p
is also 4p; it prints the next line. For example,
you can print the 3rd and 4th lines of this file
using
   3p
   .+1p
   w
   q
where "3p" prints the third line, as usual,
and then ".+1p" prints the next or fourth line.
Try that.  Type "ready" when done.
#create Ref
caslon
century schoolbook
86
#create file
baskerville
bodoni
caslon
century schoolbook
futura
helvetica
news gothic
times roman
#copyout
#pipe
ed file
#user
#unpipe
#uncopyout
tail -3 .ocopy >X1
#cmp Ref X1
#log
#next
8.2b 5
9.1a 10
Commit	Line	Data
3eb5d546 C	1	#print
	2	You can give addresses involving simple arithmetic
	3	to move around in the file. For example,
	4	3+1p
	5	is the same as
	6	4p
	7	in the editor. Now that's not interesting, but
	8	if the current line (".") is line 3, then
	9	.+1p
	10	is also 4p; it prints the next line. For example,
	11	you can print the 3rd and 4th lines of this file
	12	using
	13	3p
	14	.+1p
	15	w
	16	q
	17	where "3p" prints the third line, as usual,
	18	and then ".+1p" prints the next or fourth line.
	19	Try that. Type "ready" when done.
	20	#create Ref
	21	caslon
	22	century schoolbook
	23	86
	24	#create file
	25	baskerville
	26	bodoni
	27	caslon
	28	century schoolbook
	29	futura
	30	helvetica
	31	news gothic
	32	times roman
	33	#copyout
	34	#pipe
	35	ed file
	36	#user
	37	#unpipe
	38	#uncopyout
	39	tail -3 .ocopy >X1
	40	#cmp Ref X1
	41	#log
	42	#next
	43	8.2b 5
	44	9.1a 10