Delete a line from a file

Ruby
1

Hi

i have a file this

/dev/cciss/c0d10p1 /root/file/file-55 ext3
defaults,noatime,nodiratime 1 0
/dev/cciss/c0d11p1 /root/file/file-11 ext3
defaults,noatime,nodiratime 1 0
#/dev/cciss/c0d12p1 /root/file/file-SPARE ext3
defaults,noatime,nodiratime 1 0

Now i want to delete
#/dev/cciss/c0d12p1 /root/file/file-SPARE ext3
defaults,noatime,nodiratime 1 0

which has SPARE word

so i am doing this .

require ‘fileutils’

f=File.new("fstab ")
f.each do |line|
instattr <<line
if line =~/SPARE/
DLETE THE LINE
end

    end

end

But how to delete that line ???

Can any one please help me with this
Thanks

2

Read the file into a string, modify the string, overwrite the file with
the new string.

3

Joel P. wrote in post #1074655:

Read the file into a string, modify the string, overwrite the file with
the new string.

For a small file its fine. But if the file is big then
That’s the solution?

4

On Tue, Sep 4, 2012 at 6:23 PM, Ferdous ara [email protected]
wrote:

Joel P. wrote in post #1074655:

Read the file into a string, modify the string, overwrite the file with
the new string.

For a small file its fine. But if the file is big then
That’s the solution?

Then read line by line writing to a temporary file, skipping the line
you want to delete, then rename the file.

Jesus.

5

Am 04.09.2012 18:23, schrieb Ferdous ara:

Joel P. wrote in post #1074655:

Read the file into a string, modify the string, overwrite the file with
the new string.

For a small file its fine. But if the file is big then
That’s the solution?

You could read and write line by line (writing to a new file),
omitting the line you want to delete, then overwrite
the old file with the new file.

But IMO Joel’s suggestion is simpler. Is the file usually that big?

6

But IMO Joel’s suggestion is simpler. Is the file usually that big?

I have some massive files (1-3 MB in size) that I have to manipulate and
Ruby
handles them without any problems and very quickly (much faster than a
few other
languages I’ve tried this with).

Wayne