Data stream variables


#1

Hi

I want to print all lines wihtch contains the string “Open” from a bunch
of ‘xml’ files. Additionally I want to print the filename and the line
number of the match.

The problem with the following snippet is, that the variable ‘$.’ does
not reset the line number at the beginning of a new file.

That menas, the printed file numbers are not correct except for the
first file of ‘*.xml’

ruby -n -e ‘puts ($FILENAME + " " + $…to_s + “” + $_) if /Open/’ *.xml

Does anybody have a idea, on how to print the correct line number?

Thanks a lot for your answer, Alain.


#2

On Mon, Jan 12, 2009 at 3:21 PM, Alain H.
<removed_email_address@domain.invalid

wrote:

first file of ‘*.xml’

ruby -n -e ‘puts ($FILENAME + " " + $…to_s + “” + $_) if /Open/’ *.xml

Does anybody have a idea, on how to print the correct line number?

Thanks a lot for your answer, Alain.

Posted via http://www.ruby-forum.com/.

Does it all have to be done in ruby?
Why not
ls *.xml | xargs ruby -n -e ‘puts ($FILENAME + " " + $…to_s + “” + $_)
if
/Open/’


Andrew T.
http://ramblingsonrails.com
http://www.linkedin.com/in/andrewtimberlake

“I have never let my schooling interfere with my education” - Mark Twain


#3

Andrew T. wrote:

On Mon, Jan 12, 2009 at 3:21 PM, Alain H.
<removed_email_address@domain.invalid

wrote:

first file of ‘*.xml’

ruby -n -e ‘puts ($FILENAME + " " + $…to_s + “” + $_) if /Open/’ *.xml

Does anybody have a idea, on how to print the correct line number?

Thanks a lot for your answer, Alain.

Posted via http://www.ruby-forum.com/.

Does it all have to be done in ruby?
Why not
ls *.xml | xargs ruby -n -e ‘puts ($FILENAME + " " + $…to_s + “” + $_)
if
/Open/’


Andrew T.
http://ramblingsonrails.com
http://www.linkedin.com/in/andrewtimberlake

“I have never let my schooling interfere with my education” - Mark Twain

Thanks a lot for your answer.

Sadly I’m running Windows XP.

But I try to get GnuWin32 running…

Alain


#4

On 12.01.2009 14:21, Alain H. wrote:

ruby -n -e ‘puts ($FILENAME + " " + $…to_s + “” + $_) if /Open/’ *.xml

Does anybody have a idea, on how to print the correct line number?

Thanks a lot for your answer, Alain.

I’m not Alain, but… :slight_smile: Just kidding.

Here’s how to do it:

ruby -ne ‘puts “#$FILENAME #$. #$_” if /Open/; $.=0 if ARGF.eof?’ *.xml

Cheers

robert


#5

On Mon, Jan 12, 2009 at 9:14 PM, Robert K.
removed_email_address@domain.invalidwrote:

first file of ‘*.xml’
Here’s how to do it:

I was wondering if you could reset the line counter but didn’t think of
just
setting $. = 0
Sometimes ruby is just too easy :slight_smile: I still sometimes think things need
to
be more complicated.


Andrew T.
http://ramblingsonrails.com
http://www.linkedin.com/in/andrewtimberlake

“I have never let my schooling interfere with my education” - Mark Twain


#6

On Mon, Jan 12, 2009 at 4:45 PM, Alain H.
<removed_email_address@domain.invalid

wrote:

But I try to get GnuWin32 running…

Alain

Posted via http://www.ruby-forum.com/.

Alain

Sorry, I made a mistake with my answer above. Instead of using xargs
(which
was exactly the same as your method - actually)
Use find to make sure ruby gets a unique file each time:
find *.xml -exec ruby -n -e ‘puts ($FILENAME + " " + $…to_s + “” + $_)
if
/Open/’ {} ;
–still doesn’t help on Windows though

Instead of trying to do this in a one-liner, save the following as a
file:
ARGV.each do |filename|
File.open(File.join(File.dirname(FILE), filename)) do |file|
while line = file.gets
puts (filename + " " + $…to_s + “” + $_) if line =~ /Open/
end
end
end

And then run:
ruby *.xml

Hopefully that helps


Andrew T.
http://ramblingsonrails.com
http://www.linkedin.com/in/andrewtimberlake

“I have never let my schooling interfere with my education” - Mark Twain


#7

On 12.01.2009 20:33, Andrew T. wrote:

Thanks a lot for your answer, Alain.

I’m not Alain, but… :slight_smile: Just kidding.

Here’s how to do it:

ruby -ne ‘puts “#$FILENAME #$. #$_” if /Open/; $.=0 if ARGF.eof?’ *.xml

I was wondering if you could reset the line counter but didn’t think of just
setting $. = 0

IMHO the tricky bit is to know when to reset, i.e. to know that
ARGF#eof? signals the end of a single file and not all files. :slight_smile:

Sometimes ruby is just too easy :slight_smile: I still sometimes think things need to
be more complicated.

:slight_smile: The other area where I simplified your piece of code is the string
handling. Btw, when String interpolation (i.e. #$GLOBAL or #{expr}) you
do not need the explicit to_s.

Kind regards

robert