Gary Johnson wrote:
On 2007-03-31, Auro Ashish Saha <[EMAIL PROTECTED]> wrote:
Hello Antoine,
Thanks for your post. I tried both the options but i could not get any
result. I am using gvim. Please help.
Regards,
Auro Ashish Saha.
Auro Ashish Saha wrote:
Hello,
Please help me to remove alternate lines from a text file.
000000 00000
123456 99999
999999 99999
123445 99999
I want to delete the line 1, 3, 5 and so on. What are the commands to be
used. Thanks for help in advance.
Regards,
Auro Ashish Saha.
Method I:
q"ddjjq
<count>@"
where <count> is equal to the number of lines still to be deleted
One problem with this is that it attempts to store a sequence of
normal-mode commands into the " register, which is the unnamed
register, but then deletes the first line into this same register.
The other problem with it is that it moves the cursor too many
times: once the first line has been deleted with dd, the cursor
automatically moves to the next line, so only one j is needed to get
to the next line to be deleted.
This version will work:
qqddjq
<count>@q
Note that it uses the q register instead of the " register. Also,
if you don't want to try to figure out what <count> should be, and
if you don't want to remove a huge number of lines, you can execute
the recorded commands the first time after you record them with this
command:
@q
and every subsequent time with this command:
@@
That way, once you've recorded the command and executed it once from
the q register, you can just hold your finger on the @ key and watch
the lines disappear. As you get close to the bottom of your file,
you can start slowing down and typing just two @'s at a time.
Method II (all on one line if typed on the Vim command-line):
:let i=1 | while i <= line('$') | if (i % 2) | exe i . "delete" |
endif |
endwhile
It looks as though Tony left out part of Method II: i is never
incremented. I modified it as shown below (added "let i += 1 |")and
verified that it works.
:let i=1 | while i <= line('$') | if (i % 2) | exe i . "delete" | endif |
let i += 1 | endwhile
HTH,
Gary
Duh. My bad. Apparently I was lacking sleep when I typed that email.
Best regards,
Tony.
--
The primary purpose of the DATA statement is to give names to
constants; instead of referring to pi as 3.141592653589793 at every
appearance, the variable PI can be given that value with a DATA
statement and used instead of the longer form of the constant. This
also simplifies modifying the program, should the value of pi change.
-- FORTRAN manual for Xerox Computers
