installed fedora core 5 on a pc with USB and some usual things. in boot up it is stopped at "Starting udev:". Its harddisk light is busy. is it reconfiguring the kernel?. what do to solve this problem?. (0 Replies)
Hello all
I have to run manually make commands in our system the make compilations task's takes very long
And I like to be able to run another make task right after one is finished.
What is the best way to automate it ? (2 Replies)
Hi,
I worte a script which runs perfect when i execute it manually. But when i scheduled into cron the grep command alone is not working.
the sample script,
/usr/bin/grep FTP $subfile > /tmp/tfsrec.dat
tfs=`echo $?`
if
then
echo "FTP FOUND"
else
echo "FTP NOT FOUND"
Where... (5 Replies)
I'm curious about the behavior where any udev labeled device causes that corresponding listing to disappear from fdisk, sfdisk, or in the case of RDAC, lsvdev.
I have seen this on both EMC clariion and Sun Storagetek/Engenio 6540 arrays.
We use RHEL5.1 and udev to create persistent labels for... (2 Replies)
Hello!
I'm sorry if this is the false Forum, didn't really knew where to put it...
My question:
I have serveral USB-Sticks and wrote several Udev-Rules for theme, each Sticks needs to do something else, but all are using the same script (they have common tasks to do) and only some parts are... (2 Replies)
hi
i want to automate fdisk command .
i spawned a process containing fdisk command from a process
and tried to send the options to fdisk promt from that process.
but that spawed process is notstarting itself
help me out
trying for two days
:wall:
my code:
#!/bin/bash
echo... (5 Replies)
Hello,
MBR partition table made by linux fdisk looks certainly not correct when printed by openbsd fdisk:
Partition table created on linux (centos 6.3):
# fdisk -l /dev/sdc
Disk /dev/sdc: 10.7 GB, 10737418240 bytes
255 heads, 63 sectors/track, 1305 cylinders
Units = cylinders of 16065 *... (2 Replies)
I have made a program that reads a text file and checks for palindromic words and then outputs them. They each appear on a new line with a count of the number of occurences beside each of the words.
Requirements for being classed as palindrome are that the word must have at least 3 letters and... (7 Replies)
Discussion started by: greenhouse91
7 Replies
LEARN ABOUT LINUX
tee
TEE(2) Linux Programmer's Manual TEE(2)NAME
tee - duplicating pipe content
SYNOPSIS
#define _GNU_SOURCE
#include <fcntl.h>
ssize_t tee(int fd_in, int fd_out, size_t len, unsigned int flags);
DESCRIPTION
tee() duplicates up to len bytes of data from the pipe referred to by the file descriptor fd_in to the pipe referred to by the file
descriptor fd_out. It does not consume the data that is duplicated from fd_in; therefore, that data can be copied by a subsequent
splice(2).
flags is a series of modifier flags, which share the name space with splice(2) and vmsplice(2):
SPLICE_F_MOVE Currently has no effect for tee(); see splice(2).
SPLICE_F_NONBLOCK Do not block on I/O; see splice(2) for further details.
SPLICE_F_MORE Currently has no effect for tee(), but may be implemented in the future; see splice(2).
SPLICE_F_GIFT Unused for tee(); see vmsplice(2).
RETURN VALUE
Upon successful completion, tee() returns the number of bytes that were duplicated between the input and output. A return value of 0 means
that there was no data to transfer, and it would not make sense to block, because there are no writers connected to the write end of the
pipe referred to by fd_in.
On error, tee() returns -1 and errno is set to indicate the error.
ERRORS
EINVAL fd_in or fd_out does not refer to a pipe; or fd_in and fd_out refer to the same pipe.
ENOMEM Out of memory.
VERSIONS
The tee() system call first appeared in Linux 2.6.17.
CONFORMING TO
This system call is Linux-specific.
NOTES
Conceptually, tee() copies the data between the two pipes. In reality no real data copying takes place though: under the covers, tee()
assigns data in the output by merely grabbing a reference to the input.
EXAMPLE
The following example implements a basic tee(1) program using the tee() system call.
#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <limits.h>
int
main(int argc, char *argv[])
{
int fd;
int len, slen;
if (argc != 2) {
fprintf(stderr, "Usage: %s <file>
", argv[0]);
exit(EXIT_FAILURE);
}
fd = open(argv[1], O_WRONLY | O_CREAT | O_TRUNC, 0644);
if (fd == -1) {
perror("open");
exit(EXIT_FAILURE);
}
do {
/*
* tee stdin to stdout.
*/
len = tee(STDIN_FILENO, STDOUT_FILENO,
INT_MAX, SPLICE_F_NONBLOCK);
if (len < 0) {
if (errno == EAGAIN)
continue;
perror("tee");
exit(EXIT_FAILURE);
} else
if (len == 0)
break;
/*
* Consume stdin by splicing it to a file.
*/
while (len > 0) {
slen = splice(STDIN_FILENO, NULL, fd, NULL,
len, SPLICE_F_MOVE);
if (slen < 0) {
perror("splice");
break;
}
len -= slen;
}
} while (1);
close(fd);
exit(EXIT_SUCCESS);
}
SEE ALSO splice(2), vmsplice(2), feature_test_macros(7)COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2009-09-15 TEE(2)