Hello,
I'm using 'wget' to download a few files and then tar them up. I'm
using popen to make calls to wget and tar. Problem is that it tries to
call tar right after the wget call. I need to wait for wget to finish.
Here is what i've got so far.
categories = [...]
categories.each_with_index { |url,i|
IO.popen("wget -r -np -l 0 -w 4 #{url}")
IO.popen("tar -zcf public_html/category_#{i}.tar.gz files")
}
Thanks in advance.
Ricardo
The solution would be to do
IO.popen("...")
Process.wait
However since you aren't apparently even using the IO capabilities of popen, why not simply make use of system? It will automatically wait for the process to exit
e.g.
system("wget -r -np -l 0 -w 4 #{url}")
Of course if the only reason you are using IO.popen is to prevent output to the console you can do
system("wget -r -np -l 0 -w 4 #{url} 2>&1 >/dev/null")
Or even:
Process.wait Process.fork { STDOUT.reopen("/dev/null", "w"); STDERR.reopen("/dev/null", "w"); exec("wget -r -np -l 0 -w 4 #{url}") }
On Apr 11, 2006, at 1:31 AM, |MKSM| wrote:
Hello,
I'm using 'wget' to download a few files and then tar them up. I'm
using popen to make calls to wget and tar. Problem is that it tries to
call tar right after the wget call. I need to wait for wget to finish.
Here is what i've got so far.categories = [...]
categories.each_with_index { |url,i|
IO.popen("wget -r -np -l 0 -w 4 #{url}")
IO.popen("tar -zcf public_html/category_#{i}.tar.gz files")
}Thanks in advance.
Ricardo
Hello,
I'm using 'wget' to download a few files and then tar them up. I'm
using popen to make calls to wget and tar. Problem is that it tries to
call tar right after the wget call. I need to wait for wget to finish.
Here is what i've got so far.categories = [...]
categories.each_with_index { |url,i|
IO.popen("wget -r -np -l 0 -w 4 #{url}")
here you have a pipe that's been returned. wget is writing to it. you simply
need to read all of wget's output and close the pipe:
IO.popen("wget -r -np -l 0 -w 4 #{url}"){|pipe| pipe.read}
IO.popen("tar -zcf public_html/category_#{i}.tar.gz files")
}Thanks in advance.
Ricardo
-a
On Tue, 11 Apr 2006, |MKSM| wrote:
--
be kind whenever possible... it is always possible.
- h.h. the 14th dali lama
Thanks for your suggestion. I'm going with the last one using a block
with popen. That way i can easily send the output to a logfile.
Best Regards,
Ricardo
On 4/11/06, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
On Tue, 11 Apr 2006, |MKSM| wrote:
> Hello,
>
> I'm using 'wget' to download a few files and then tar them up. I'm
> using popen to make calls to wget and tar. Problem is that it tries to
> call tar right after the wget call. I need to wait for wget to finish.
> Here is what i've got so far.
>
> categories = [...]
>
> categories.each_with_index { |url,i|
> IO.popen("wget -r -np -l 0 -w 4 #{url}")here you have a pipe that's been returned. wget is writing to it. you simply
need to read all of wget's output and close the pipe:IO.popen("wget -r -np -l 0 -w 4 #{url}"){|pipe| pipe.read}
> IO.popen("tar -zcf public_html/category_#{i}.tar.gz files")
> }
>
> Thanks in advance.
>
> Ricardo
>
>-a
--
be kind whenever possible... it is always possible.
- h.h. the 14th dali lama
fyi. you still need to call Process.wait if you also want the status. with
my session lib you can do this as
require 'session'
sh = Session::SH::new
stdout, stderr = '', ''
append = lambda{|o,e| stdout << o if o; stderr << e if e}
status =
sh.execute("wget -r -np -l 0 -w 4 #{url}", &append)
status =
sh.execute("tar -zcf public_html/category_#{i}.tar.gz files", &append)
where stdout and stderr can be anything that supports '<<'. the above starts
only one child process as well.
regards.
-a
On Tue, 11 Apr 2006, |MKSM| wrote:
Thanks for your suggestion. I'm going with the last one using a block
with popen. That way i can easily send the output to a logfile.Best Regards,
--
be kind whenever possible... it is always possible.
- h.h. the 14th dali lama