I write a sh script that zip and copy to tape all files that older then 2 hours.
1. The way I choose is - touch a file with "now - 2 hours", then use fine with '! -newer'
2. Do you have any other idea to do it ?
tnx. (1 Reply)
I wonder how I shall read the result below, especially 'what'
shown below.
The result was shown when I entered 'w'.
E.g what is TOP? What is gosh ( what does selmgr mean?)?
login@ idle JCPU PCPU what
6:15am 7:04 39 39 TOP
6:34am 6:45 45 45 TOP
6:41am ... (1 Reply)
I asked a similar question earlier and got a very good answer but a new doubt came up. This is a few lines of a '/sbin/ifconfig' command on my PC:
RX packets:3781025 errors:0 dropped:0 overruns:0 frame:0
TX packets:1941909 errors:0 dropped:0 overruns:0 carrier:0
Does the RX and TX packets... (1 Reply)
Hi, guys, I have a big problem.
I've got a sun solaris 4.1.4 workstation, and the /var/adm/message file will add one row every few seconds. It soon becomes a large file.
I wander if there are some mistakes configuring the workstation.
the /var/adm/message is as follow:
... (1 Reply)
Hi, guys, I have a big problem.
I've got a sun solaris 4.1.4 workstation, and the /var/adm/message file will add one row every few seconds. It becomes a large file in a short time.
I wander if there are some mistakes configuring the workstation.
the /var/adm/message is as follow:
... (3 Replies)
Here is a crude procmail recipe that I quickly created (NOT a procmail recipe expert, btw) that has been catching lots of spam (current second after the charset_spam recipe posted earlier):
:0B
* .*If.you.do.not.wish.to.receive...*
more_spam
:0B
* You.requested.to.receive.this.mailing... (0 Replies)
Somehow someone created a file named '-ov' in the root directory.
Given the name, the how was probably the result of some cpio command they bozo'ed.
I've tried a number of different ways to get rid of it using * and ? wildcards, '\' escape patterns etc.. They all fail with " illegal option --... (3 Replies)
Hopefully this doesn't come off as too much of a "newbie" question or a flamebait. But I have recently begun working with a Sun Solaris box after having spent the past five years working with RedHat. From what i can tell, thing look fairly similar and the 'man' command is some help. But I've... (7 Replies)
Discussion started by: deckard
7 Replies
LEARN ABOUT SUSE
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 3.25 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)