hi
i am having a file of following kind:
20015#67143645#143123#4214
62014#67143148#67143159#456
15432#67143568#00143862#4632
54112#67143752#0067143657#143
54623#67143357#167215#34531
65446#67143785#143598#7456
75642#67143546#156146#845
24464#67143465#172532#6544... (5 Replies)
I have some process . How should i know that the process is still processing data or got hanged even though it is showing that it is running in background
I know of a command called truss. how should i use this command and determine
1) process is still processing data
2) process got hanged... (7 Replies)
I have a file, first 5 columns are very normal, like "1107",106027,71400,"Y","BIOLOGY",,
however, the 6th columns, the user can put comments, anything, just any characters, like new line, double quote, single quote, whatever from the keyboard, like"Please load my previous SOM597G course content in... (3 Replies)
Hi!
I have 2 files containing data that I need to process at the same time, I have problems in reading a different number of lines from the different files.
Here is an explanation of what I need to do (possibly with an awk script).
File "samples.txt" contains data in the format:
time_instant... (6 Replies)
Hello guys!
I have some issue in how to processing some data.
I have some files with 3 columns. The 1st column is a name of my sample. The 2nd column is a numerical sequence (very big sequence) starting from "1". And the 3rd column is a feature of each line, represented for a number (completely... (2 Replies)
Dear fellow members,
I've just joined the forum and am a newbie to shell scripting and programming. I'm stuck on the following problem.
I'm working with large scale genomic data and need to do some analyses on it. Essentially it is text processing problem, so please don't mind the scientific... (0 Replies)
Hello,
I need to read the pipe data as:-
cat abc.txt | uuencode abc.txt | mailx -s hi xyz@xyz.com
I will override the mailx function so that when mailx is called, it calls my version of maix and in that function I want to read the file which is attached in progional mailx function- abc.txt... (7 Replies)
Hello,
I have some bitrate data in a csv which is in an odd format and is difficult to process in Excel when I have thousands of rows. Therefore, I was thinking of doing this in bash and using awk as the primary application except that due to its complication, I'm a little stuck.
... (24 Replies)
I have a ksh93 script I use that processes a file list in the order that they exist in the list. I would like to speed up processing of the list by having multiple processes handle it at once. I was thinking that perhaps a good way to handle this would be to write the list to a named pipe and some... (4 Replies)
I have below Data ***************************************************
********************BEGINNING-1********************
directive url is : https://coursera-eu.mokar.com/directives/96df29ff-176a-35f7-8b1b-4ce483d15762
Src urls are :... (8 Replies)
Discussion started by: nikhil jain
8 Replies
LEARN ABOUT FREEBSD
pipe2
PIPE(2) BSD System Calls Manual PIPE(2)NAME
pipe, pipe2 -- create descriptor pair for interprocess communication
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
pipe(int fildes[2]);
int
pipe2(int fildes[2], int flags);
DESCRIPTION
The pipe() system call creates a pipe, which is an object allowing bidirectional data flow, and allocates a pair of file descriptors.
The pipe2() system call allows control over the attributes of the file descriptors via the flags argument. Values for flags are constructed
by a bitwise-inclusive OR of flags from the following list, defined in <fcntl.h>:
O_CLOEXEC Set the close-on-exec flag for the new file descriptors.
O_NONBLOCK Set the non-blocking flag for the ends of the pipe.
If the flags argument is 0, the behavior is identical to a call to pipe().
By convention, the first descriptor is normally used as the read end of the pipe, and the second is normally the write end, so that data
written to fildes[1] appears on (i.e., can be read from) fildes[0]. This allows the output of one program to be sent to another program: the
source's standard output is set up to be the write end of the pipe, and the sink's standard input is set up to be the read end of the pipe.
The pipe itself persists until all its associated descriptors are closed.
A pipe that has had an end closed is considered widowed. Writing on such a pipe causes the writing process to receive a SIGPIPE signal.
Widowing a pipe is the only way to deliver end-of-file to a reader: after the reader consumes any buffered data, reading a widowed pipe
returns a zero count.
The bidirectional nature of this implementation of pipes is not portable to older systems, so it is recommended to use the convention for
using the endpoints in the traditional manner when using a pipe in one direction.
RETURN VALUES
The pipe() function returns the value 0 if successful; otherwise the value -1 is returned and the global variable errno is set to indicate
the error.
ERRORS
The pipe() and pipe2() system calls will fail if:
[EMFILE] Too many descriptors are active.
[ENFILE] The system file table is full.
[ENOMEM] Not enough kernel memory to establish a pipe.
The pipe2() system call will also fail if:
[EINVAL] The flags argument is invalid.
SEE ALSO sh(1), fork(2), read(2), socketpair(2), write(2)HISTORY
The pipe() function appeared in Version 3 AT&T UNIX.
Bidirectional pipes were first used on AT&T System V Release 4 UNIX.
The pipe2() function appeared in FreeBSD 10.0.
BSD May 1, 2013 BSD