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• How do you pipe output from a Ruby script to 'head' without getting a broken pipe error

  - by dan

  I have a simple Ruby script that looks like this require 'csv' while line = STDIN.gets array = CSV.parse_line(line) puts array[2] end But when I try using this script in a Unix pipeline like this, I get 10 lines of output, followed by an error: ruby lib/myscript.rb < data.csv | head 12080450 12080451 12080517 12081046 12081048 12081050 12081051 12081052 12081054 lib/myscript.rb:4:in `write': Broken pipe - <STDOUT> (Errno::EPIPE) Is there a way to write the Ruby script in a way that prevents the broken pipe exception from being raised?

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• Converting Celsius Processor Temperature to Fahrenheit

  - by WindowsEscapist

  I'm editing a Conky theme. I would like it to output the processor temperatures in degrees Fahrenheit instead of Celsius. In the ~/.conkyrc file, the command sensors | grep 'Core 0' | cut -c18-19 is used to find the temperature in Celsius for the first processor core. I want to use bc to compute this (give it outputvalue*9/5+32). Problem is, bc wants just absolute values, and I see no way to pass it program output. If I try to use something like temp=$(sensors | grep 'Core 0' | cut -c18-19) & echo 'temp*9/5+32' | bc, it ends up giving me 32 because it registers "temp" as a 0.

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• Replacing every 10th pipe with new line in unix

  - by user327958

  Lets say I have fields: name, number, id I have a data file: name1|number1|id1|name2|number2|id2...etc I want to replace every 3rd pipe with a new line or '\n' so I get: name1|number1|id1 name2|number2|id2 I'm having no luck with awk or sed. I've tried the following, and variations of: awk '/"\|"/{c++;if(c==10){sub("\|","\n");c=0}}1' inputfile.txt sed 's/"|"/"\n"/2' inputfile.txt It tells me awk: syntax error near line 1 awk: illegal statement near line 1 awk: syntax error near line 1 awk: bailing out near line 1 Any help is greatly appreciated! EDIT: Thank you!

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• Named pipe is using 100% CPU

  - by willwill

  I'm starting the script with ./file.py < pipe >> logfile and the script is: while True: try: I = raw_input().strip().split() except EOFError: continue doSomething() How could I better handle named pipe? This script always run at 100% CPU and it need to be real-time so I cannot use time.sleep.

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• Named pipe blocking with user nobody

  - by dnagirl

  I have 2 short scripts. The first, an awk script, processes a large file and prints to a named pipe 'myfifo.dat'. The second, a Perl script, runs a LOAD DATA LOCAL INFILE 'myfifo.dat'... command. Both of these scripts work when run locally like so: lee.awk big.file & lee.pl However, when I call these scripts from a PHP webpage, the named pipe blocks: $awk="/path/to/lee.awk {$_FILES['uploadfile']['tmp_name']} &"; $sql="/path/to/lee.pl"; if(!exec($awk,$return,$err)) throw new ZException(print_r($err,true)); //blocks here if(!exec($sql,$return,$err)) throw new ZException(print_r($err,true)); If I modify the awk and Perl scripts so that they write and read to a normal file, everything works fine from PHP. The permissions on the fifo and the normal file are 666 (for testing purposes). These operations run much more quickly through a named pipe, so I'd prefer to use one. Any ideas how to unblock it? ps. In case you're wondering why I'm going to all this aggravation, see this SO question.

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• get SSL Broken pipe error when try to make push notification

  - by emagic

  We develop an iPhone app, and have push notification for development and ad hoc version working properly. But when we try to send push notification to real user devices in our database, we got SSL connection reset, then Broken pipe error. We think maybe there are too many devices in our database (more than 70000), so it is failed to send all messages at the same time. So we try to send messages to 1000 devices once, but still got this "Broken pipe" error for around 100 messages. And we are not sure whether the messages have been send. Any suggestion?

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• Generate name for Named Pipe

  - by Mike

  What is the "best way" to generate a name for a Windows named pipe so it will not conflict with other processes?

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• Question about pipe in Perl

  - by Uri

  The following code is working sort of fine: open( PIPE, '-|', 'ant' ); for( <PIPE> ) { print; } However, it doesn't do what I want. Since the Ant build can take 5 minutes, I would like to see the output line by line. Instead, I'm getting the entire input at the end of the process. Looking at it with the Perl debugger, Perl waits at the 'for' statement, until Ant terminates. Why is that?

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• How to pipe two CORE::system commands in a cross-platform way

  - by Pedro Silva

  I'm writing a System::Wrapper module to abstract away from CORE::system and the qx operator. I have a serial method that attempts to connect command1's output to command2's input. I've made some progress using named pipes, but POSIX::mkfifo is not cross-platform. Here's part of what I have so far (the run method at the bottom basically calls system): package main; my $obj1 = System::Wrapper->new( interpreter => 'perl', arguments => [-pe => q{''}], input => ['input.txt'], description => 'Concatenate input.txt to STDOUT', ); my $obj2 = System::Wrapper->new( interpreter => 'perl', arguments => [-pe => q{'$_ = reverse $_}'}], description => 'Reverse lines of input input', output => { '>' => 'output' }, ); $obj1->serial( $obj2 ); package System::Wrapper; #... sub serial { my ($self, @commands) = @_; eval { require POSIX; POSIX->import(); require threads; }; my $tmp_dir = File::Spec->tmpdir(); my $last = $self; my @threads; push @commands, $self; for my $command (@commands) { croak sprintf "%s::serial: type of args to serial must be '%s', not '%s'", ref $self, ref $self, ref $command || $command unless ref $command eq ref $self; my $named_pipe = File::Spec->catfile( $tmp_dir, int \$command ); POSIX::mkfifo( $named_pipe, 0777 ) or croak sprintf "%s::serial: couldn't create named pipe %s: %s", ref $self, $named_pipe, $!; $last->output( { '>' => $named_pipe } ); $command->input( $named_pipe ); push @threads, threads->new( sub{ $last->run } ); $last = $command; } $_->join for @threads; } #... My specific questions: Is there an alternative to POSIX::mkfifo that is cross-platform? Win32 named pipes don't work, as you can't open those as regular files, neither do sockets, for the same reasons. The above doesn't quite work; the two threads get spawned correctly, but nothing flows across the pipe. I suppose that might have something to do with pipe deadlocking or output buffering. What throws me off is that when I run those two commands in the actual shell, everything works as expected.

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• Windows batch file: Pipe destroys my return code

  - by murxx

  Hi, is it possible to return the errorlevel also if I pipe the output of a script into a logfile: test1.bat: call test2.bat 2>&1 | tee log.txt echo ERRORLEVEL: %ERRORLEVEL% test2.bat: exit /B 1 Output when calling test1.bat: ERRORLEVEL: 0 The errorlevel is always 0. The problem is, I want to call another script inside my script where the output should be redirected synchronously with the output shown in the command line, therefore a simple is not enough for me. I tried several ideas, but result is that the pipe always seems to destroy the given error-level... :( Can you give me any further suggestions? Thanks in advance... :)

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• gpg symmetric encryption using pipes

  - by Thomas

  I'm trying to generate keys to lock my drive (using DM-Crypt with LUKS) by pulling data from /dev/random and then encrypting that using GPG. In the guide I'm using, it suggests using the following command: dd if=/dev/random count=1 | gpg --symmetric -a >./[drive]_key.gpg If you do it without a pipe, and feed it a file, it will pop up an (n?)curses prompt for you to type in a password. However when I pipe in the data, it repeats the following message four times and sits there frozen: pinentry-curses: no LC_CTYPE known assuming UTF-8 It also says can't connect to '/root/.gnupg/S.gpg-agent': File or directory doesn't exist, however I am assuming that this doesn't have anything to do with it, since it shows up even when the input is from a file. So I guess my question boils down to this: is there a way to force gpg to accept the passphrase from the command line, or in some other way get this to work, or will I have to write the data from /dev/random to a temporary file, and then encrypt that file? (Which as far as I know should be alright due to the fact that I'm doing this on the LiveCD and haven't yet created the swap, so there should be no way for it to be written to disk.)

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• Bash Parallelization of CPU-intensive processes

  - by ehsanul

  tee forwards its stdin to every single file specified, while pee does the same, but for pipes. These programs send every single line of their stdin to each and every file/pipe specified. However, I was looking for a way to "load balance" the stdin to different pipes, so one line is sent to the first pipe, another line to the second, etc. It would also be nice if the stdout of the pipes are collected into one stream as well. The use case is simple parallelization of CPU intensive processes that work on a line-by-line basis. I was doing a sed on a 14GB file, and it could have run much faster if I could use multiple sed processes. The command was like this: pv infile | sed 's/something//' > outfile To parallelize, the best would be if GNU parallel would support this functionality like so (made up the --demux-stdin option): pv infile | parallel -u -j4 --demux-stdin "sed 's/something//'" > outfile However, there's no option like this and parallel always uses its stdin as arguments for the command it invokes, like xargs. So I tried this, but it's hopelessly slow, and it's clear why: pv infile | parallel -u -j4 "echo {} | sed 's/something//'" > outfile I just wanted to know if there's any other way to do this (short of coding it up myself). If there was a "load-balancing" tee (let's call it lee), I could do this: pv infile | lee >(sed 's/something//' >> outfile) >(sed 's/something//' >> outfile) >(sed 's/something//' >> outfile) >(sed 's/something//' >> outfile) Not pretty, so I'd definitely prefer something like the made up parallel version, but this would work too.

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• Force line-buffering of stdout when piping to tee

  - by houbysoft

  Usually, stdout is line-buffered. In other words, as long as your printf argument ends with a newline, you can expect the line to be printed instantly. This does not appear to hold when using a pipe to redirect to tee. I have a C++ program, a, that outputs strings, always \n-terminated, to stdout. When it is run by itself (./a), everything prints correctly and at the right time, as expected. However, if I pipe it to tee (./a | tee output.txt), it doesn't print anything until it quits, which defeats the purpose of using tee. I know that I could fix it by adding a fflush(stdout) after each printing operation in the C++ program. But is there a cleaner, easier way? Is there a command I can run, for example, that would force stdout to be line-buffered, even when using a pipe?

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• WCF Named Pipe IPC

  - by Peter M

  I have been trying to get up to speed on Named Pipes this week. The task I am trying to solve with them is that I have an existing windows service that is acting as a device driver that funnels data from an external device into a database. Now I have to modify this service and add an optional user front end (on the same machine, using a form of IPC) that can monitor the data as it passes between the device and the DB as well as send some commands back to the service. My initial ideas for the IPC were either named pipes or memory mapped files. So far I have been working through the named pipe idea using WCF Tutorial Basic Interprocess Communication . My idea is to set the Windows service up with an additional thread that implements the WCF NamedPipe Service and use that as a conduit to the internals of my driver. I have the sample code working, however I can not get my head around 2 issues that I am hoping that someone here can help me with: In the tutorial the ServiceHost is instantiated with a typeof(StringReverser) rather than by referencing a concrete class. Thus there seems to be no mechanism for the Server to interact with the service itself (between the host.Open() and host.Close() lines). Is it possible to create a link between and pass information between the server and the class that actually implements the service? If so, how? If I run a single instance of the server and then run multiple instance of the clients, it seems that each client gets a separate instance of the service class. I tried adding some state information to the class implementing the service and it was only retained within the instance of the named pipe. This is possibly related to the first question, but is there anyway to force the named pipes to use the same instance of the class that is implementing the service? Finally, any thoughts on MMF vs Named Pipes? Thanks for you help

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• "|" pipe operator not working in command line in C++

  - by user332024

  I am having a windows application interacting with DB2 database. In my application i have code to execute some DB2 commands through command line interface. I have used windowsAPI "ShellExecuteEx()" to execute those DB2 commands through command line. Following is the code written to execute DB2 command through command line. string command = "/c /w /i DB2 UNCATALOG NODE DB_DATABASE "" test.log | echo %date% %time% test.log SHELLEXECUTEINFO shellInfo; ZeroMemory(&shellInfo, sizeof(shellInfo)); shellInfo.cbSize = sizeof(shellInfo); shellInfo.fMask = SEE_MASK_FLAG_NO_UI | SEE_MASK_NOCLOSEPROCESS; //shellInfo.lpFile = "db2cmd"; shellInfo.lpFile = "db2cmd"; shellInfo.lpParameters = command.c_str(); The code is executed successfully , however if test.log is observered i only get result of DB2 command and not date and time. If you see the above command there is "|" pipe operator and echo command to log date and time in test.log Please note that if I execute above DB2 command through separately command line i.e. not through code. I am able to view date and time log along with DB2 command result in test.log. Following is the full command which i executed through command line. DB2CMD /c /i /w DB2 UNCATALOG NODE DB_DATABASE "" test.log | echo %date% %time% test.log According to me since DB2 command is executed successfully through code, there is problem with only usage of "|" pipe operator or echo command.

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• How to get the output of a php script executed by a piped mail?

  - by xun2

  I've configured an email address to pipe (forward) all emails to /path/to/script.php I thought I'll receive the output of the script as an email reply but it doesn't work. How can I get the output of the script and send a reply email with the output as the email content? (*) I know I can use mail() inside the script but I don't have permissions to edit the script, and I can't copy the script because it's being updated from time to time.

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• Unix commandline to repeat command with pipes

  - by bguiz

  I want to write a script that will repeat a commandline that usually contains pipes ./myscript.sh ls -lart |grep ^d And in myscript.sh I do a bunch of stuff, and then want to execute ls -lart |grep ^d and pipe the output from that into something else. (sorry in advance if this is really simple and has a 1-liner solution). So far I have tried $@ | someothercommand and $* | someothercommand But to no avail...

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• IIS 7.5 - Remove the pipe character from usernames for virtual hosts

  - by glasnt

  Currently I have a setup with a virtual FTP site in IIS 7.5 that requires the following authentication details for the anonymous account: Host: ftp.mydomain.com User: ftp.mydomain.com|anonymous Pass: <none> I have multiple FTP accounts setup on this same server. I know that this means I need to specify the domain in the username to let IIS know what I need site to authenticate against, but is it possible to make the username only be anonymous? Would I have to create a user by that name in the windows users and groups area to be and specifically link it there?

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• How to pipe text from command line to the clipboard

  - by Ville Koskinen

  I'd like to do something like dir *.* > clipboard ie. get to get the standard output of a command line program copied to the clipboard. Can this be done on a standard XP machine without additional programs?

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• Launch only the command if the previous one worked inside SSH, SHELL

  - by Namari

  I've got a SHELL script which is using a pipe to separate my 2 commands: ssh -oBatchMode=yes user@hostname "mysql -u yop -pyop -c yop | echo test" The problem is even if my connection to mysql doesn't work, it send the echo test. I would like to forbid my script to send any command if the previous command doesn't work. I search with a if condition but it seems it not possible with it :( Does anyone have an idea ? Thanks, Namari

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• Does Apache spawn piped logger on each HTTP request?

  - by Xepoch

  I am examining a high-volume Apache prefork site and noticing that many log entries such as: CustomLog '|/foo/bar/cronolog -foo -bar' RewriteLog '|/foo/bar/cronolog -bar -foo' When apache logs the request or the rewrite is cronolog spawned for EACH request or is the pipe opened and written-to for the lifetime duration of the preforked apache process? (This was asked on stackoverflow but I'll remove from there as more applicable here I think.)

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• Podcasting: Pipe internet audio to conference calls

  - by Mike Fielden

  I have a podcast and we use Skype and Audio Hijack to record all of us. How would I go about piping audio so the other people on the Skype conference call can hear it real time? I would like a software solution if possible. I realize they are several hardware solutions available.

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• Piping Mail with Exim: Only Works Locally

  - by John

  Whenever I send an email to my catchall alias via SSH (i.e., locally), Exim successfully pipes the e-mail to a PHP script, as I told it to do. However, when I try to send an e-mail to my catchall alias via my e-mail client (i.e., remotely), Exim won't pipe the e-mail. Any ideas?

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• Pipe ex command into vim register?

  - by Shawn J. Goff

  I would like to do get the output of an ex command placed in a register. I know there is the :redir command, but that requires three commands to accomplish the task. Is there a native way to do it in one command?

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• postfix "mail-pipe" alias shellscript creates permissionless files/dirs

  - by Gung Foo

  I am using an alias to a shellscript in postfix... After the script that is called by the shellscript creates a directory it has no permissions at all.. #!/bin/sh umask 002 cat | php /var/www/html/catchmymail rcvemail result is like this: d--------- 2 apache apache 4096 Sep 17 17:25 50 it works for files tho: -rw-rw---- 1 apache apache 5836288 Sep 18 11:21 test Not even setting umask 002 in the shellscript before it hands the mail on changes a thing Setting umask(0002) inside catchmymail has no effect either. Has anyone seen this behaviour before or an idea to save my day?!? This is extremely confusing and actually insane behaviour from what i understand about umask and file permissions.

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