hi,
i wat to get the output of a grep command in a file. but when i am trying out the same grep command in the unix prompt its working fine.. i am getting the output properly.. but when i am writing the same command inside my shell script , its just creating a new output file with no contents... (11 Replies)
Hi folks,
Please advise which command/command line shall I run;
1) to display the command and its output on console
2) simultaneous to save the command and its output on a file
I tried tee command as follows;
$ ps aux | grep mysql | tee /path/to/output.txt
It displayed the... (7 Replies)
How to redirect the output to multiple files without putting on console
I tried tee but it writes to STDOUT , which I do not want.
Test.sh
------------------
#!/bin/ksh
echo "Hello " tee -a file1 file2
----------------------------
$>./Test.sh
$>
Expected output:
-------------------... (2 Replies)
Is there a utility built into Solaris that will allow me to see console messages from a tty?
I've done a search and see that this is possible through software like ILOM, but I'm looking for a method to do this with built in utilities.
For example, on AIX, I can use swcons `tty` (6 Replies)
Hi Everyone,
Can anyone please tell me, how can I redirect the grep command output to same file. I am trying with below command but my original file contains no data after executing the command.
$grep pattern file1 > file1
Kind Regards,
Eswar (5 Replies)
When i use the command to check the preview of the filesets to be installed using CLI
# When using this commad 'm able to see all Preview view of the filesets to be installed
installp -apgX -d "." all
# When I redirected the same output to a file 'm able to see only half the details... (1 Reply)
I have set up a bash script to run a long list of things that I need to time. I would like to redirect the output of time to a file. I have set it up like,
echo "Runtimes for servlet 4, 100K structures" > test_times.txt
echo "" >> test_times.txt
echo "runs where N=10" >> test_times.txt
echo... (7 Replies)
(/home/user1)-> more script.sh
#!/bin/ksh
( echo open devicename
sleep 3;
echo user;
sleep 2;
echo password;
sleep 2;
echo "/info/dump"; ---------> This needs to redirect to a file .Can be number of pages
sleep 2;
echo "exit" ) | telnet
Please use code tags next time for... (2 Replies)
Hi,
I'd like to redirect the STDOUT output from my script to a file and simultaneously display it at a console.
I've tried this command:
myscript.sh | tail -f
However, it doesn't end after the script finishes running
I've also tried this:
myscript.sh | tee ~/results.txt
But it writes... (3 Replies)
I'm trying to find out what happened to the rogue game that apt-get told me it installed, so I thought I would find the file. I went to the root and entered:
find -name "rog*.*"
I get a large number of lines saying my access is denied in various directories. I figure I'll practice my Unix... (14 Replies)
Discussion started by: arghvark
14 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)