It has nothing to do with your C++ code. command.str() needs to look like this:
This redirects stderr to stdout, so both streams will be merged and returned as stdout to your program.
what's the proper syntax to redirect output, including all errors?
ls -la > direct.list makes out put file direct.list
but if i'm running a script and i want to include the errors, would i type something like:
myscript.scr 2> out_list.txt or will that get the errors only? (1 Reply)
Hi all,
I am getting the following error when I try to do a build of a product.
I dont have the dependencies of the binaries involved in the build and thats the reason I was not able to find which library to add or to proceed to the next step to solve the reference problem.
Undefined ... (1 Reply)
I need to find a way to keep a running tally of how many times events or actions occur. Say if a user is prompted to make inputs of 1 or 2, I want it to keep track of how many times 1 was entered, and how many times 2 was entered.
Thanks for your help (5 Replies)
Hi,
I'm writing a scheduling script which will co-ordinate the launching of scripts.
This script is scheduling based on an input file, and launches the appropriate scripts at the right times.
The only issue I'm having is:
- if a script dies, or even has a syntax error, I want to catch... (1 Reply)
Need help redirecting output to a file including errors if any,I have 2 script namely push.ksh and run.ksh, I'm scp'ing push.ksh to another server and executing remotely via run.ksh, the script run.ksh runs locally but does not capture any errors in "servername.out" file (I tried testing various... (10 Replies)
for
ga016dgf -> /usr/bin/last | cut -c1-3
Invalid record size. Unable to continue ...
any ideas?
running on
ga016dgf -> uname -a
HP-UX ga016dgf B.11.31 U ia64 1246079591 unlimited-user license
thank you.
Video tutorial on how to use code tags in The UNIX and Linux Forums. (4 Replies)
Hi folks,
I am trying to send an email in Perl script with the below code.
I have written the code in Padre IDE and installed all the required modules(Mail::Sendmail) and executed the code.
It is neither showing errors nor giving the output. I havnt received an mail after running the below... (1 Reply)
This script produces no errors. It also does not produce an output file. Any ideas?
#!/usr/bin/python
import tarfile
output_filename = 'etc.tar'
source_dir = '/etc/'
#To build a .tar.gz for an entire directory tree:
def make_tarfile(output_filename, source_dir):
with... (2 Replies)
Hi Guys,
I am new to python and I am trying to print ouput of Popen on my text screen (tkinter gui).
I was able to make it work on Linux with this code:
Linux: Working
def PrintSomething2():
outputdata = commands.getstatusoutput("sudo fping -f host.list")
for i in outputdata:... (2 Replies)
Hi,
When I run the command "print_manifest | grep "Main Memory", I get the note :
# /opt/ignite/bin/print_manifest | grep "Main Memory"
NOTE: Could not read the /etc/resolv.conf file.
Main Memory: 196498 MB
#
How do I suppress the part :
NOTE: Could not read the... (4 Replies)
Discussion started by: anaigini45
4 Replies
LEARN ABOUT DEBIAN
stdin
STDIN(3) Linux Programmer's Manual STDIN(3)NAME
stdin, stdout, stderr - standard I/O streams
SYNOPSIS
#include <stdio.h>
extern FILE *stdin;
extern FILE *stdout;
extern FILE *stderr;
DESCRIPTION
Under normal circumstances every UNIX program has three streams opened for it when it starts up, one for input, one for output, and one for
printing diagnostic or error messages. These are typically attached to the user's terminal (see tty(4) but might instead refer to files or
other devices, depending on what the parent process chose to set up. (See also the "Redirection" section of sh(1).)
The input stream is referred to as "standard input"; the output stream is referred to as "standard output"; and the error stream is
referred to as "standard error". These terms are abbreviated to form the symbols used to refer to these files, namely stdin, stdout, and
stderr.
Each of these symbols is a stdio(3) macro of type pointer to FILE, and can be used with functions like fprintf(3) or fread(3).
Since FILEs are a buffering wrapper around UNIX file descriptors, the same underlying files may also be accessed using the raw UNIX file
interface, that is, the functions like read(2) and lseek(2).
On program startup, the integer file descriptors associated with the streams stdin, stdout, and stderr are 0, 1, and 2, respectively. The
preprocessor symbols STDIN_FILENO, STDOUT_FILENO, and STDERR_FILENO are defined with these values in <unistd.h>. (Applying freopen(3) to
one of these streams can change the file descriptor number associated with the stream.)
Note that mixing use of FILEs and raw file descriptors can produce unexpected results and should generally be avoided. (For the masochis-
tic among you: POSIX.1, section 8.2.3, describes in detail how this interaction is supposed to work.) A general rule is that file descrip-
tors are handled in the kernel, while stdio is just a library. This means for example, that after an exec(3), the child inherits all open
file descriptors, but all old streams have become inaccessible.
Since the symbols stdin, stdout, and stderr are specified to be macros, assigning to them is nonportable. The standard streams can be made
to refer to different files with help of the library function freopen(3), specially introduced to make it possible to reassign stdin, std-
out, and stderr. The standard streams are closed by a call to exit(3) and by normal program termination.
CONFORMING TO
The stdin, stdout, and stderr macros conform to C89 and this standard also stipulates that these three streams shall be open at program
startup.
NOTES
The stream stderr is unbuffered. The stream stdout is line-buffered when it points to a terminal. Partial lines will not appear until
fflush(3) or exit(3) is called, or a newline is printed. This can produce unexpected results, especially with debugging output. The
buffering mode of the standard streams (or any other stream) can be changed using the setbuf(3) or setvbuf(3) call. Note that in case
stdin is associated with a terminal, there may also be input buffering in the terminal driver, entirely unrelated to stdio buffering.
(Indeed, normally terminal input is line buffered in the kernel.) This kernel input handling can be modified using calls like tcse-
tattr(3); see also stty(1), and termios(3).
SEE ALSO csh(1), sh(1), open(2), fopen(3), stdio(3)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 2008-07-14 STDIN(3)