Help with lineno

Ruby
1

Hi, so I’m not clear with what lineno does. I’m trying to print the
number
of lines in the file ‘testfile’. However it says. "Undefined method
‘lineno’ for 105:Fixnum (NoMethodError)

Can someone help me out with that? This is what I’ve written. Please
forgive my ignorance.

fo = File.open(“testfile.odt”, “w”) do |file|
file.write(“So basically we’re just testing this motherfucking thing.
This
is the second line. And this is the third.”)
end

line = fo.lineno

puts line

–
Himel S.,
himelsarkarforever.blogspot.com
http://himelsarkarforever.blogspot.com

  • Here’s to the crazy ones. The misfits. The rebels. The troublemakers.
    The
    round pegs in the square holes. The ones who see things differently.
    They’re not fond of rules. And they have no respect for the status quo.
    You
    can quote them, disagree with them, glorify or vilify them. About the
    only
    thing you can’t do is ignore them. Because they change things. They push
    the human race forward. And while some may see them as the crazy ones,
    we
    see genius. Because the people who are crazy enough to think they can
    change the world are the ones who do.*
2

On Sat, Feb 8, 2014 at 4:51 PM, Himel S. [email protected]
wrote:

fo = File.open(“testfile.odt”, “w”) do |file|
file
.write(“So basically we’re just testing this motherfucking thing. This is
the second line. And this is the third.”)
end

Well the reason you are getting this error is because. fo doesn’t has
the
file object instead it has the value return from the block you ran. For
the
function lineno to work you need do these two operation separately.

line = fo.lineno

The right code would be:

fo = File.open(“testfile.odt”, “w”)
fo
.write(“So basically we’re just testing this motherfucking thing. This
is
the second line. And this is the third.”)
line = fo.lineno

puts line

http://csnipp.com/coderhs/83

3

Harisankar P S wrote in post #1136024:

The right code would be:

fo = File.open(“testfile.odt”, “w”)
fo
.write(“lines of text”)
line = fo.lineno #<~~ It will give an error, as you opened it for write
mode.

4

Oh sorry i missed out an important thing. The ‘w’ attribute in the file
open means the file is open only for writing, we need to open for
reading.
So just update the code as so

fo = File.open(‘test.txt’, ‘r’)

5

Thank you for taking the time to reply. However now I’m getting the
error
‘lineno’: not opened for reading (IOError)

On Sat, Feb 8, 2014 at 5:03 PM, Harisankar P S [email protected] wrote:

Well the reason you are getting this error is because. fo doesn’t has the
fo = File.open(“testfile.odt”, “w”)

–
Harisankar P S
https://twitter.com/coder_hsps | http://tech.hsps.in

–
Himel S.,
himelsarkarforever.blogspot.com
http://himelsarkarforever.blogspot.com

  • Here’s to the crazy ones. The misfits. The rebels. The troublemakers.
    The
    round pegs in the square holes. The ones who see things differently.
    They’re not fond of rules. And they have no respect for the status quo.
    You
    can quote them, disagree with them, glorify or vilify them. About the
    only
    thing you can’t do is ignore them. Because they change things. They push
    the human race forward. And while some may see them as the crazy ones,
    we
    see genius. Because the people who are crazy enough to think they can
    change the world are the ones who do.*
6

Thank you so much!

It’s working now! :slight_smile:

On Sat, Feb 8, 2014 at 5:17 PM, Harisankar P S [email protected] wrote:

‘lineno’: not opened for reading (IOError)

is the second line. And this is the third.")

can quote them, disagree with them, glorify or vilify them. About the only
https://twitter.com/coder_hsps | http://tech.hsps.in

–
Himel S.,
himelsarkarforever.blogspot.com
http://himelsarkarforever.blogspot.com

  • Here’s to the crazy ones. The misfits. The rebels. The troublemakers.
    The
    round pegs in the square holes. The ones who see things differently.
    They’re not fond of rules. And they have no respect for the status quo.
    You
    can quote them, disagree with them, glorify or vilify them. About the
    only
    thing you can’t do is ignore them. Because they change things. They push
    the human race forward. And while some may see them as the crazy ones,
    we
    see genius. Because the people who are crazy enough to think they can
    change the world are the ones who do.*
7

Harisankar P S wrote in post #1136028:

Oh sorry i missed out an important thing. The ‘w’ attribute in the file
open means the file is open only for writing, we need to open for
reading.
So just update the code as so

fo = File.open(‘test.txt’, ‘r’)

Still an error you would get, as you didn’t close it. It will be as
below :

fo = File.open(“testfile.odt”, “w”)
fo.write(“foo/nbar/nbaz/n”)
fo.close

or

this does fo.close automatically.

File.open(“testfile.odt”, “w”) do |fo|
fo.write(“foo/nbar/nbaz/n”)
end

#now read the file.

fo = File.open(“testfile.odt”, “r”)
line = fo.lineno

puts line