I am using the time command in a script however the output of the time command will display on my screen but not my output file. Any Ideas on how to fix this?
> cat test.sh
#############################
#!/usr/bin/sh
for COMMAND in pwd
do
time ${COMMAND}
done | sed "s/^/ ... (4 Replies)
I am using ksh on an AIX box.
I would like to redirect the stdout and stderr to a file but also show them on the terminal. Is this possible? I have tried tee within my file without success.
This is the code I have so far
exec > imp.log 2>&1 | tee exec 1>&1
I am new to shell scripting, so... (3 Replies)
exam is a ksh script. In command line I enter: exam 3 param_2 param_3 param_4.
In exam how can I get the value of the parameter which position is specified by the first argument.
Simply doing this DOES NOT work:
offset=$1
value=$$offset
can you figure out any possible way to interpret a... (5 Replies)
Hello all,
I have a script that I am trying to execute and redirect the output to a file, but I have trouble in redirection. The cron job is running properly as I see it in the mail.
This is what I am doing
In crontab file,
0 4 * * * somescript.sh > /some_location/`date '+%m%d%y_%H%M'`.log... (9 Replies)
Hi,
I need to create one KSH which will send mail to set of recipients using "mailx" command like below.
mailx -s "Test mail" "test@yahoo.com, test@gmail.com" <$output.txt
The recipients are in different domains (like yahoo, gmail, etc.).
My requirement is, if any mail is undelivered,... (1 Reply)
Hi,
I have perl script which is calling an external command using "system()" with argument.
But i am not able to capture the output.Even tried with backtick also with no luck.
.
.
$number=<>;
system ("cmd $number >output.txt"); (2 Replies)
Hello,
i'm trying to implement the times() function and i'm programming in C.
I'm using the "struct tms" structure which consists of the fields:
The tms_utime structure member is the CPU time charged for the execution of user instructions of the calling process.
The tms_stime structure... (1 Reply)
I have a script to send an email like below. Problem is, the if ..fi block is not getting executed, and is coming as a part of the email body. Can anyone take a look at this? :confused:
Log file shows this:
SEND_MAIL.prog: line 64:
: command not found
echo "Input Parameters"
echo... (11 Replies)
Hello all,
I would like to create a for loop or whatever is quick that will print the one’s place of a number for 1-N times
say for example a printed page formatting is 132 characters wide,
I would like a single line
123456789012345678901234567890... ...012
That is 132 characters long. I... (11 Replies)
Hi
Please can you help how do I count the number of specific characters or words that appear in a file? (8 Replies)
Discussion started by: fretagi
8 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)