Hi,
I am doing this perl script
print (@line(1..15));
the lines 1 to 15 get printed...
how can i redirect this to file?
thanks and regards
vivek.s (4 Replies)
I was simply trying to redirect some output in a log file but it foxed me.
truss a.out > log
It gave only the output of the a.out which was only a simple print "Hello"
Then I tried
truss a.out 2&1>a
echo `truss a.out` > a
All failed.
What am i missing.
Thanks (7 Replies)
Hello Experts,
I am facing the following problem ..
>cat my_file prints
initial begin
StartSim;
LDR(on); // Lock Detect Enable
But when I trying the same with the following command it shows me all the line in the same line.Like
... (4 Replies)
my querry is
suppose i have duplicate std i/p with FD-3 --exec 0<&3
now redirected std i/p to a file ----exec 0<file1
suppose i am reading the file line by line --while read LINE
cutting some fields and comparing it with a variable and if a match is found
... (0 Replies)
hi
i want a solution for the fallowing:
i am redirecting output from bash script in which we are running background commands like
./test.sh
contains
ls -l &
ps
when we do as
./test.sh 1> test.txt 2>&1
but test.txt not containing output as ls -l and ps.
it showing ls -l, ps and... (2 Replies)
Hi all,
Maybe someone is able to help:
Need to redirect the output of a command in realtime to a second command. Command-A executes a remote shell to another host, and outputs its results. Command-B displays a "dialog" with the outputs of Command-A.
Command-A Output:
Updating FileA... (2 Replies)
Hi,
I have to migrate Korn Shell who call Sybase command into Oracle Command.
I have a problem on this example :
DATNUM=$(
sqlplus -S SA/SASASA@MIGGVDEV <<!
SET FEEDBACK OFF;
SET HEADING OFF;
select sybase_utilities.datediff('DAY', '01/01/1900', '01/01/2000') from... (4 Replies)
Hi All,
i m facing very strange problem . like suppose i am in one directory and then i type ls
it will display the content of directory then i redirect the output as
sneha-pardus $ ls > test
sneha-pardus $ cat test
a.sh b.sh c.sh
sneha-pardus $ awk ' { print $1 } ' test > test... (3 Replies)
I almost reach my objective (Youhouuu !!!!)
But I really don't understand why it doesn't work until the end... :wall:
For clarity's sake I am taking a very simple example. The operations I am doing in the script (gsub and print) really don't have any importance !!! I just matter about... (10 Replies)
I've got a problem with file redirection in bash, in loop while (in my script done < bufor.txt). In every consecutive iteration there's a possibility that to the bufor.txt will be added some lines. Unfortunately, in loop, added lines are ignored (for example: bufor.txt has 5 lines, in 3rd iteration... (4 Replies)
Discussion started by: kk9
4 Replies
LEARN ABOUT DEBIAN
tee
TEE(2) Linux Programmer's Manual TEE(2)NAME
tee - duplicating pipe content
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#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; library support was added to glibc in version 2.5.
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)COLOPHON
This page is part of release 3.44 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 2012-05-04 TEE(2)