General :: Ruby Program Which Use Standard Input?
May 15, 2010
I am using Red Hat Enterprise Version 5. There is a ruby program which use standard input as its input (e.g. the Ruby program process input from standard input). I think standard input should be keyboard, correct?
So, I think other kinds of input (non-standard input) should not work (i.e. the ruby program should not be able to read input from such non-standard input), but actually I have tried using pipe works, I am so confused because I think pipe should be some other kinds of input -- other than standard input, why it could work? i.e. put text "123" in abc.txt with pipe, could achieve the same result as using keyboard as input to type "123" for the ruby program.
cat abc.txt | ~/test/rubysrc/foo.rb
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Nov 18, 2010
I have the following code:
Code:
And it gives this error:
Code:
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Feb 23, 2011
Is there already a program that reads multiple pipes or file descriptors and writes to the standard output (not splitting lines).Like cat, but reading all files simultaneously and preserving lines.It is needed to avoid coding of select/epoll loops or using multithreading in simple programs. Like "select loop for bash".
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Jul 12, 2010
I need to create backup of internal drive and write it on DVD. I want to do this in single command...like below: ntfsclone -f --save-image --overwrite - /dev/sda1 | growisofs -Z /dev/sr1=/dev/stdin
in above command, i tried to to create backup of first partition of internal drive and need to write this backup on DVD. But above command has some probolem due to which it could not write backup on DVD....and how to read from standard input in 'growisofs' command?
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Jan 5, 2010
The code is attached..My intention is that getchar which usually blocks,should come out after 5 seconds(VTIME).But this is not happening..can anyone tell me the mistake that I make..?
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
[code]...
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May 5, 2010
I would like to use Japanese kana (hiragana, katakana, kanji) on Ubuntu but everything that I've tried to get it set up and running isn't working. The Spanish that I have set up is working perfectly so far.
I've read, the SCIM input program should start up automatically when loading a program, it doesn't. When I have it loaded I cannot seem to get the input working.
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Apr 26, 2010
I've been using rubyripper quite happily on Karmic, now I've moved to Lucid and discovered a bit of an issue. rubyripper will pause for several minutes between tracks with ruby 1.8. If I upgrade to ruby 1.9.1 the gui client won't run due to an issue with libgtk2-ruby not being available for 1.9.1.
The cli version of rubyripper under 1.9.1 is blazingly fast, so that is what I'm using at the moment, but I do prefer the gui.
Anyone have any insight into this? Googling suggests there may be a bug in ruby 1.8.7 that caused the long pauses, but it was supposed to have been fixed in 1.8.7.249 i.e. the default Lucid version.
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Jun 28, 2011
I cant convert audio files using flac with standard input. I tried the commands such as:
Code:
mpg321 -b 10000 -s -r 44100 -w - file.mp3 | flac - -o file.flac
or:
Code:
ogg123 -d wav -f - file.ogg | flac - -o file.flac
[Code]....
All such conversions doesnt produce any *.flac file. It seems flac doesnt accept minus sign for the standard input although flac manual allows to use it.
So my question is how I can use the standard input in order to decode audio data with flac?
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Oct 22, 2010
There are a few things not working properly. Ruby version manager seems ok but untill i get working with ruby i don't know if it is working properly. One thing that is not there is irb Interactive ruby is not available according the the message i get.
Well i have no idea what readline is but i did everything that is on that webpage referance page [url]. I have got a lot of progress and learned heaps about linux shell and bash terminal. The thing is i need to get this going and have tried feenode but it is very foreign and how it works i do not have a clue. I have got 2 things resolved so far through this forum but using other threads in it. i need to get irb going before i can progress to using ruby on Rails properly.
I am using a Eeepc running ubuntu easy peasy its version 9.04 of ubuntu. I need the whole of rails to work and want to get a handle on using ruby version manager along with the apache stack with mysql/phpmyadmin and am using this as a dummy run for setting up a development system.
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Apr 22, 2011
Just did an upgrade in Wheezy and found my synaptics touchpad borked. Easy enough fix, though.aptitude install xserver-xorg-input-synaptics-devRebooted (probably could have just modprobed) and all is wellSo, I guess the standard xserver-xorg-input-synaptics is undergoing some weird changes at the moment.
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Sep 27, 2010
I have a machine with 8 cores. I have a directory of input files that I need to process using a non-parallelized program. I would like to write a script that works its way through a list of commands executing 8 commans (i.e., instances of this program; each with specific flags having to do with the current input file) until the list of commands has been exhausted. Is there an easy way to do this?
Code:
hamstrsearch_local-hmmer3.pl -protein -refspec=lotgi_2713 -hmmset=lophotrochozoa_hmmer3 -sequence_file=Aplysia_californica.fas -taxon=ACAL
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Sep 25, 2010
I have a file with two fields of numbers that I want to use as input for another program.
Code:
The above code does not work, as I think it would take the whole first and second fields as the input for one particular instance of the program 'inputbashangle'. What I want is to get the first two numbers from the first line of the file 'outfailtest', execute 'inputbashangle' with them, then move on to the first two numbers of the second line for all the lines of 'outfailtest'.
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Jul 6, 2010
I Just got the ADS VideoXpress video capture USB thing (Plug composite video and audio into it, and plug it into a computers USB port). Anyway, I've tried to install what came on the CD, with Wine, but still cant view any video. I don't need it to record from it, I just want to view the video live as it passes through. I don't even need audio, just the basic low quality video.
Anyone know where I can find a program to view the raw input?[URL]..
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Aug 14, 2010
I am creating a 15 integer array which is input from the user and outputted for the.
Ex.
Enter the array values: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Your values are: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Code:
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Apr 11, 2010
i have to write a program which checks the information inside a text file to make sure it is all integers and then convert the integers to roman Numerals. My program seems to have a bit of a problem and im not sure where exactly the problem is....
Code:
#include<stdlib.h>
#include<string>
[code]....
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Apr 13, 2011
I started to run a C++ my program in Linux and I don't know how to test my program that works fine with a text file. This is a project for my uni and to explain more clear, My program is a sample database for modify or add and search and it read data from a binary file and also write into a binary file. I have got an input from my lecture and she said after compiling in Linux I must write:
1-to compile:
Code:
g++ (files with cpp)
2-to see the output:
Code:
./a.out
3-to test with input:
Code:
./a.out < input.txt >
My problem is in step three. What I must write in the command part after" step2" to see the output?
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Aug 11, 2010
(Using Archlinux) I downloaded Ruby 1.8.7-174 a while ago and installed it via the tarball (not pacman). I was trying to update to 1.8.7-299, but I can't get it to work. Per the readme, I do the following steps, all of which complete without error:
./configure
make
make install
After install finishes however, I still have -174 installed instead of -299.
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May 3, 2010
My current gem env returns:
RubyGems Environment:
- RUBYGEMS VERSION: 1.3.6
- RUBY VERSION: 1.8.7 (2008-08-11 patchlevel 72) [x86_64-linux]
[code]....
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Oct 5, 2010
It is little weird now that cron job is not working as i have set. I have set weekly job to send email but i am receiving multiple emails daily. Below is my code; # sends email every monday at 4:00 am 00 04 * * 1 /usr/bin/ruby /home/mbm/www/current/script/runner /home/mbm/www/current/app/models/add_to_delayed_job.rb -e production
00 -> Minutes
04 -> Hours (0-24)
1 -> Days / 0-6 / Sun - Sat
Sending email is fine but the time is not working so far as set.
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Apr 11, 2011
Trying to understand my ruby folder structure? Why my gems are scattered all over and why they aren't recognised commands. I'll explain how my installation looks like first:
/usr/bin/ruby
/usr/bin/ruby1.8
/usr/bin/ruby1.9.1
The first is a soft link to ruby1.9.1 because the "ruby" command didn't work in the terminal. I did the same with "gem". I installed rubygems through downloading, extracting and then running setup.rb here: (I created the "ruby" folder)
/home/pc/ruby/rubygems-1.7.2/setup.rb
/usr/bin/gem
/usr/bin/gem1.8
/usr/bin/gem1.9.1
I installed a few gems with "sudo gem install"
> gem list
*** LOCAL GEMS ***
compass (0.10.6)
haml (3.0.25)
mustache (0.99.3)
rake (0.8.7)
So far so good? Well not quite, as it turns out the command "compass version" doesn't seem to exist. My confusion grows with each folder I look into. The following path doesn't make any sense to me, for example. Why would it be hidden? Why is mustache the only gem inside this folder?
/home/pc/.gem/ruby/1.9.1/cache/mustache-0.99.3.gem
First of all, here is "gem environment", which makes even less sense, because I have definately installed rubygems-1.7.2 like I told you in the first paragraph, but here it shows an ancient version 1.3.7. Why? I installed Ubuntu the day before yesterday.
RubyGems Environment:
- RUBYGEMS VERSION: 1.3.7
- RUBY VERSION: 1.9.2 (2010-08-18 patchlevel 0) [x86_64-linux]
- INSTALLATION DIRECTORY: /var/lib/gems/1.9.1
- RUBY EXECUTABLE: /usr/bin/ruby1.9.1
- EXECUTABLE DIRECTORY: /var/lib/gems/1.9.1/bin
- RUBYGEMS PLATFORMS: .....
Ruby --version returns "ruby 1.8.7"...........
Also, as it turns out, all gems are installed into this folder (mustache too! even though it already is inside the other folder), just as "ruby environment" claims:
/var/lib/gems/1.9.1/gems. But none of these gems work. I can't call any of these, except rake. So here is where I probably made the mistake, I think I used "apt-get install rake" in addition to "gem install rake", because the command "rake" wasn't recognised, and the command prompt suggested it. I may have done so with rubygems too... I'm new to Linux, and I figured that the command prompt knew how to install this stuff properly. It can't be normal that I have to create syslinks all over, right? In Windows I didn't run into this problem.
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Apr 7, 2010
i am trying to write a program which will read input from a text file, check if each line contains any alphabets and then display a message imforming me if there is an alphabet in each line. My text file is formatted in this way...
[Code]....
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Jan 11, 2010
Title : Author : Price
France : Mark : 40
Persia : John : 50
how i arranged my database. I am trying to write aprogram which does a search either using Title, Author or both.
[Code]....
but i am still unclear on how i am able to make the program check if either on of the input(either $Title or $Author) is not filled up, and if one of it is not filled up, use the other one which is filled to do a search.
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Apr 6, 2011
basically i have to create a simple program with will continually read input from the user until they enter a blank linei know how to read in certain input but not sure how to get it continually in a loop
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Apr 12, 2011
I'm wondering if it's POSIX + ASCII or something else is mixed in?
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Aug 9, 2011
I have a crontab that wgets a PHP page every five minutes (just to run some the PHP code), and I want to send the output to /dev/null. I couldn't find it in the wget manual.
I'm looking for something like:
wget -o stout http://whatever.com/page.php > /dev/null
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Feb 23, 2011
I ran into an issue that was written up here on LQ and/or on other sites, the one dealing with an error similar to the following one: error trying to exec 'cc1plus': execvp: No such file or directoryThe solution seems is to make g++ and gcc versions consistent. I've since remedied that, but am slightly confused with my findings and concerned with my solution.
When I first looked in /usr/bin for all references to g++ and gcc, I saw that there were two version of gcc and one version of g++:
(Note the "??? ?? ????" as date for gcc. I've since made some changes, but this was essentially the set of gcc and g++ files that existed before I started.)
I'm told that the system I'm using is an "out of the box" installation, i.e. no modifications. As installed, gcc is the newer version and does not correspond to g++34:
Confusion and concern: When I use makefiles from software I've adopted, I run into the cc1plus problem eluded to above. The cc1plus error occurred because the makefiles expected there to be a command named "g++," so I created a symbolic link, pointing /usr/bin/g++ -> /usr/bin/g++34. And in doing so, g++ was not consistent with gcc. I've since fixed that, i.e. copied the gcc34 version to gcc and my software builds fine.
My question are:
1. Will copying the gcc34 version to gcc cause issues in the future, possibly related to upgrades and/or istallations of other packages that rely on "gcc"? Currently the files are as follows:
2. Were the g++ and gcc files in /usr/bin the "out of the box" versions?
3. How can I answer a question like this in the future, without posting to LQ, i.e. is there a reference to find this type of information?
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Aug 23, 2010
Is there some sort of standards file path convention for installing softwares that I could follow through? For example, I just learnt how to build Nginx from source. But the default binary path set by nginx is "/usr/local/nginx/sbin". I have seen a couple of tutorials which they specify the location of the installed binary and it is very different from those usual default paths. Thus, got me thinking whether is there some form of file path convention that I should follow?Is there some kind of list which states where do those packages on Debian.org Repository usually installed to?
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Feb 9, 2010
[1st off...I used to host my music (A&R) website on a dedicated windows server...'cause I thought it was necessary for streaming .wma files. when I discovered it wasn't...I went w/ a standard hosting package, w/ GoDaddy...
BUT...
I moved my recording studio's site to it's own domain. [it used to be a series of pages on my A&R site.]
I now need to create a '301 Redirect' in my old site's directory to redirect surfers (who have my old url) to the new site...but more importantly...to retain my ranking w/ the major search engines...!
It cannot be done on a Windows server (which I'm on, w/ GoDaddy)...not an .htm redirect anyway, which I need. I've tried all the php, asp, etc. scripts...they don't work. [&...I don't think I really need windows features like php or asp...I code my site(s) in Dreamweaver as html pages.]
so...If I migrate my site(s) to a Linux server...
1) Will standard .wma streaming continue to work...? (i.e., a .wax file in the directory that points to the .wma).
2) Which type of server is FASTER for this task...(if any)...Linux or Windows...?
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Apr 27, 2010
I'm trying to set the time in an embedded system ... There isn't a link/file /etc/localtime and /usr/ has only two subdirectories /usr/bin and /usr/sbin.Is there something I can try or do I just give up and make UTC be my timezone?
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Jan 10, 2011
I'm working on a SBC9261 board with touchscreen, running Linux 2.6.24./dev/ttyS0 is the standard output and /dev/tty0 is the console on the touchscreen.What I would like to do is to clone the standard output to the touchscreen, so the console would be displayed twice.
It would be like :
Code:
~ $ ./whatEverScript > /dev/tty0
but the output would also appear on /dev/ttyS0.
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