[unix-history] / usr / lib / learn / editor / L19.2a

#print
To avoid just accumulating lines forever, you need some
way of getting rid of them.  The 'd' command (delete) removes
lines you don't want.  Since it also removes lines that
you do want if you tell it to, you should be careful
with this command.  Deleting one line at a time
is always pretty safe.  For example
  5d
will delete line 5 of a file.  Try the following
sequence; note that I've used "cat"
for a change.

cat bmt
ed bmt
5d
w
q
cat bmt
ready
#create Ref
14th st
23rd st
28th st
34th st
times square
49th st
57th st
#create bmt
14th st
23rd st
28th st
34th st
42nd st
times square
49th st
57th st
#user
#cmp bmt Ref
#log
#next
19.3b 3
19.2c 8
Commit	Line	Data
fd15fd37 BJ	1	#print
	2	To avoid just accumulating lines forever, you need some
	3	way of getting rid of them. The 'd' command (delete) removes
	4	lines you don't want. Since it also removes lines that
	5	you do want if you tell it to, you should be careful
	6	with this command. Deleting one line at a time
	7	is always pretty safe. For example
	8	5d
	9	will delete line 5 of a file. Try the following
	10	sequence; note that I've used "cat"
	11	for a change.
	12
	13	cat bmt
	14	ed bmt
	15	5d
	16	w
	17	q
	18	cat bmt
	19	ready
	20	#create Ref
	21	14th st
	22	23rd st
	23	28th st
	24	34th st
	25	times square
	26	49th st
	27	57th st
	28	#create bmt
	29	14th st
	30	23rd st
	31	28th st
	32	34th st
	33	42nd st
	34	times square
	35	49th st
	36	57th st
	37	#user
	38	#cmp bmt Ref
	39	#log
	40	#next
	41	19.3b 3
	42	19.2c 8