Hi,
Can some1 help me to output a tab in an echo statement.
I have tried
echo "RNC: \t NODEB"
but dont get the correct output.
I am a beginnger to unix, so pls hold back the laughs....if u can (5 Replies)
Hello All,
I need to set the width or number of columns for my dynamic output in the echo statement.
statement is like:
echo " <output> "
here the <output> is dyamice and can be of any number of characters, the " " should always start in same column everytime it is... (4 Replies)
I have script like
echo -n FINISHED FEXP: ${TABLE2EXP}
echo $STATUS
I want the output of both the echo statement in one line
How can i do this (3 Replies)
I was searching for an option where i can echo some strings together with the contents of a file.
Eg. I was to echo the below string to a file
"alter application PMS_ add variable CurrYear Y2009;" >> ${ESS_MAXL_DIR}/PMS_SUB.txt
The value 2009 is coming from a file called date.txt without the... (3 Replies)
Hi,
How do you echo something once when a find statement returns null results?
This is when using mutiple locations and mutiple arguments.
The below find command the inner loop of a nested for loop where the outter loop holds the $args and the inner loop holds the locations.
find... (2 Replies)
I need to concatinate a string (mapping-expression) with the output of below statement
EXPRESS="cat //normalization-binding//tag-normalization/tag-name"
echo $EXPRESS | xmllint --shell QA_Oct12_DIR.cfb | grep -v "/ >" >> "/home/testBinding.txt"
above statement write value="$6061" into... (1 Reply)
Hi Friends,
I am trying a very simple thing to print through bash shell scripting using echo but failing. My script is-
A=Abha
B=Biha
C=2011
D=5
echo " The name is $A_$B$C0$D"
It should print-
"The name is Abha_Biha201105"
but it's printing something else. Is my script wrong?... (2 Replies)
I have this code that sometimes return a false value and the code inside the if statement gets executed and error out. Any idea why? thanks.
So I set a debug and see what the value for $ScriptElapsedTime
Here is the value I got ScriptElapsedTime='03:20'. Base on this value the if... (10 Replies)
Discussion started by: nugent
10 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)