Programming :: Orrect Command To Create A Named Pipe File?
Apr 22, 2010
My question deals with me creating a name pipe (file) in the my /group directory called chat.I then have to write a script to read from the named pipe and save data into a file called chat.log until the words End of File are passed to the program.
-When I created the named pipe file (chat) I used the mknod chat p command..Is this the correct command to create a named pipe file? -Then I'm having trouble with my script and how to make it run until the words End of File are entered in. This is what I have so far.
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Jun 22, 2010
i'm just trying to understand named pipes in linux.For that i'm just trying to create one named pipe using mkfifo.but its not working properly..following is my code snippet. so if anyone comes across the mistake i made
Code:
#include <stdio.h>
#include <errno.h>
[code]....
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Jul 12, 2011
What is a pipe? and why a file is a named pipe? I am just learning linux.
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Apr 24, 2011
Does any one know how can i input text by reading from a named pipe to any popular GUI based text editor?
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Mar 14, 2009
Mandriva 2009, BIND 9.5.0-P2. Named will start however I'm getting the above error as well as these:
14-Mar-2009 15:45:37.084 general: error: zone 0.in-addr.arpa/IN: loading from master file /var/lib/named/var/named/reverse/named.zero failed: file not found
14-Mar-2009 15:45:37.084 general: error: zone 0.0.127.in-addr.arpa/IN: loading from master file /var/lib/named/var/named/reverse/named.local failed: file not found
[code].....
Named shows to be running but with the errors above I know it's not running correctly. I also copied the above dir's over to /var/lib/named/var/lib/named which is where I 'believe' it's chroot'd at, though I could be wrong since I'm unfamiliar with chroot.
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Aug 2, 2011
I am trying to encrypt a file on-the-fly, redirecting the output to a named pipe [fifo]. I SSH into my server and run the command:mcrypt -k key < file > named_pipethen from my laptop I try to scp it:$ scp me@server:~/dir/named_pipe d it says scp:users/home/me/dir/named_pipe: not a regular file
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Aug 11, 2010
I understand that $! is the PID of a command. For example:
Code: #!/bin/bash
myprogram &
echo "PID of myprogram is $!"
I'd like to send the output of "myprogram" to both console and to a log file using the "tee" command but I also want to store the PID of "myprogam". Something like this:
Code: #!/bin/bash
myprogram | tee ./logfile &
echo "PID of myprogram is $!"
The problem is that $! is now the PID of "tee" rather than the PID of "myprogram".
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May 9, 2010
I'm looking for an mp3 file in the firefox cache folder.I was thinking I could run the command 'find -size +2M' and pipe that output into the 'file' command to tell me which is an mp3, something like thisfind -size +2M | fileBut this doesn't work, what am I doing wrong?This is output Usage: file [-bcikLhnNrsvz0] [-e test] [-f namefile] [-F separator] [-m magicfiles] file...file -C -m magicfilesTry `file --help' for more information.
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Aug 24, 2010
Code:
$ echo 2 * 3 > 5 is a valid inequality. This will create a file in the current directory named '5' with the number '2' in it, the names of all the files in the current directory, followed by the number '3' and 'is a valid inequality.'
What I do not understand is why 'is a valid inequality' gets written to this file. I thought it would write '2', all the file names in the current directory, then '3' into the file called '5'. Why does the 'is a valid inequality.' get written to the file also?
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Mar 2, 2011
I've written a simple server in linux used fork to create a FIFO pipe.The server create two FIFO pipe.One for server read data from client and write data to client.Then another pipe for client read data from server and write data to server.When the server read data from a client used server-pipe and then write data to client.But ,if the client no read open the pipe,the server side write will be crashed because of a broken-pipe SIGPIPE. How to check whether the read side is opened?Or,how to catch the SIGPIPE,and then my server will still execute on,not crashed!!
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Apr 12, 2010
how I could save all of the mail sendmail processes to a named pipe?
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May 13, 2011
Have this script which is reading in a series of files, one at a time with while-do-done loop, each file goes through various greps/awk's where this info is then saved to various files for later use. i.e....
Script is being run on Linux Red Hat,
In one of the grep/awk's the output (currently) are 2 columns (min max), i.e....| awk '{print $1, $2}' | sort -u which outputs (e.g.)
The number of "min max" pairs varies from file to file. Want to output a single column of unique numbers from the min max pairs & get the number of them for input to a file...i.e...
Where <PROCESS> is some process/technique that will generate a single column of integers (increment of 1) to pipe into the next one (sort -u)
i.e. (example from above)
Have tried command seq - only works for single pair input i.e.
Is there any command like seq etc which will output a single column based on a input of min max numbers (increment 1) to pipe onwards to next command?
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May 3, 2011
I want to pipe the output of ls in a folder to a file (lets call it test.txt) but when i do so, but when i do ls > test.txt in test.txt there is also test.txt (logical
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Mar 10, 2011
I am trying to read from a file named matrixA.dat that contains a matrix formatted like this:
2 x 3
1 0 2 -1 3 1
I am reading the lines in, and this is the source that I have so far: Code: #include <stdio.h>
#include <string.h>
#define DATALIMIT 17
#define DIMLIMIT 5
#define NAMELIMIT 40
[Code]...
was stored in dataA, so when I print it all I get is a newline. Why didn't it grab the 1 0 2 -1 3 1 line?
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Apr 1, 2011
I am using Cent OS 5.5 and i want configure DNS, but while configuring bind i am getting below error.
#/etc/init.d/named restart Stopping named: [ OK ]
Starting named:
Error in named configuration:
/etc/named.conf:57: open: /etc/named.root.hints: file not found[FAILED]
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Sep 26, 2010
I have a pipe delimited flat file, field 27 is price. I would like to move items marked sold to a new file every couple months.
awk -F"|" '$27 == "SOLD" {print $0}' awktest2.data >> awkout2.data
Allows me to write line to new file but I need to delete the original line, I also want to make sold case insensitive tried [Ss][Oo] with no luck
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Apr 7, 2011
How would I create a sed or awk command that would add a | to the end of a line if it wasn't already there? I'm trying to import some files into mysql, but some of the lines to not end with a | which is my field delmiter.
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Nov 11, 2010
What I plan to do is, create a duplicate file of a text file, and then append some text into the new text file.
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Jul 21, 2011
I need to pipe the output of date command, to form a command like this:
mycommand -f 20110721
where 20110721 is current YearMonthDay.
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May 8, 2011
I am trying to create a launcher in Fedora 13 which will run a simple script named proj4a. I run this script from the command line as follows:
$ $HOME/proj4a >$HOME/proj4a_out
where proj4a is an executable file in my home directory and the output goes into a file, proj4a_out, in my home directory. Everything works fine. I created a launcher called Proj4a and in the command field I entered the following:
' $HOME/proj4a >$HOME/proj4a_out'
When I click on the launcher it comes back with the following: There was an error launching the application.
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Jun 29, 2010
How can I pipe the output of a shell command into a new buffer in Vim? The following obviously wouldn't work, but you can see what I'm getting at:
:!echo % | :newtab
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Sep 30, 2010
Is there a way to process the output of a locate command on the spot within bash. The output is 3 lines, ex:
Code:
[root@server confluence]# locate .timestamp
/opt/confluence/confluence-persistent/index/.timestamp
[code]....
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Sep 4, 2010
How can I create multipart rar file in Linux using the official console rar client?RAR 3.90 Copyright (c) 1993-2009 Alexander Roshal 16 Aug 2009Shareware version Type RAR -? for helpI want a multipart rar with each part size being 150 MB.
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Oct 13, 2010
How to split a tar file into smaller parts at file boundaries?
How can I create a multipart tar file in Linux?
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Sep 28, 2010
I'm trying to create a separate thread for my program which basically polls using the read command. However this new thread seems to block the main thread, anyone know why this could happen.
In main I call this function pthread_create(&mainEventThread, NULL, GenericEventThread, NULL);
which calls
/*New threads start function */
void *GenericEventThread()
{
short int i, nError = -1;
[Code]...
I've used pthread_self to check that a new thread is being created, so why is the while loop in one thread blocking the main thread from running, I haven't used the join function anywhere in my code.
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Dec 2, 2010
When I give the command:
winexe --interactive 0 --user <user>%<password> //<ip_address> 'cmd /C dir'
I receive the message:
ERROR: Cannot open control pipe - NT_STATUS_ACCESS_DENIED
The source machine is a RedHat EL4 server. The target machine is a Windows XP Home SP3 pc. When I give the same command to another pc all works fine. The other pc is a Windows XP Prof SP3.
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Feb 27, 2016
I launch a mdadm grow to expand my filesystem but I forget --backup-file.I have my server running and one UPS.
Code: Select allpk25.com:~# mdadm --manage /dev/md0 --add /dev/sde1
mdadm: added /dev/sde1
pk25.com:~# mdadm --grow --raid-devices=5 /dev/md0
mdadm: Need to backup 3072K of critical section..
pk25.com:~# mdadm --grow --raid-devices=5 --backup-file=/root/md0-grow.bak /dev/md0
mdadm: /dev/md0 is performing resync/recovery and cannot be reshaped
[code]....
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Jul 22, 2009
how to create a missing /etc/X11/xorg.conf file.
I need to set certain parameters in xorg.conf, and my old xorg.conf won't work on my latest laptop.
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May 18, 2011
How can I create a multipart 7zip file in Linux using the p7zip console client? My console app is
7-Zip [64] 9.13 beta Copyright (c) 1999-2010 Igor Pavlov 2010-04-15
p7zip Version 9.13 (locale=C,Utf16=off,HugeFiles=on,4 CPUs)
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Oct 7, 2010
can any body tell me how to creat a log file in linux...when i run the script the details must go to log file...
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