---------- Post updated at 01:25 AM ---------- Previous update was at 01:24 AM ----------
not very pretty, but must do, this time
---------- Post updated at 01:41 AM ---------- Previous update was at 01:25 AM ----------
Tried it quickly, setting $i in the loop into something nonexisting, to force an error message. It all works okay, after all, without the 2>.
The interactive shell is just waiting for the script to end, and the shell running the script is non-interactive. It's children, the pingers, can freely write to stderr even when it's a terminal, they are not in background, job control-wise. Removing the redirection of the stderr, nice to not be hiding error messages.
Treppenwitz:
expect -c 'spawn prog; interact'seems to do what I was after.
Last edited by Juha Nurmela; 10-07-2016 at 02:29 PM..
Reason: slow cogs
I have a project where I have to use bzcat to uncompress a file and use that output as the data to run another program on.
I understand that you would do (bzcat filename.bz2 ! program name) but then how do you access that data in the c program??? Please help thanks (2 Replies)
Hello!
Will someone out there pls help in clearifying what is really wrong with my system. I use window 98 as my operating system. I am connected to a proxy server for browsing the net. Whenever l am listening to music online l have the problem of intermitted break in which the playing will... (10 Replies)
Hi,
Program A: uses pipe()
I am able to read the stdout of PROGAM B (stdout got through system() command) into PROGRAM A using:
* child
-> dup2(fd, STDOUT_FILENO);
-> execl("/path/PROGRAM B", "PROGRAM B", NULL);
* parent
-> char line;
-> read(fd, line, 100);
Question:... (2 Replies)
Using ls input as example..
ls | sed 's/\n/ /'outputs with line breaks, where I was expecting the \n to disappear. I've tried \r as well wondering if terminal output used different breaks.
Is there a way to remove the line breaks without saving to file and then working from there?
----------... (2 Replies)
I have an Shell script which has few global variables
eg :
range=100;
echo "$range"
I want to use the same variable in my C++ program for example
int main()
{ cout << range << "\n"; }
i tried using this
int main(int argc, char *argv)
{ cout << range << "\n"; }
but... (5 Replies)
Can anyone tell me why does'nt the following command work?
find /gfp1/home/arijit -name "*.sas7bdat" | gzip
I am trying to compress all files with extension sas7bdat with gzip.
It gives error message
gzip: compressed data not written to a terminal. Use -f to force compression.... (5 Replies)
Hi,
I have 1 program that writes in to the STDIN of another program as shown below. Both programs contain 4 or 5 lines & would terminate in under a second.
$ driver.exe | program.exe
How is that I can attach the debugger (gdb) to program.exe ? so that I can step through and see what all... (0 Replies)
Hi
I am new to writing script and want to use a Bash Piped while-read and read from user input.
if something happens on server.log then do while loop or if something happend on user input then do while loop.
Pseudocode something like:
tail -n 3 -f server.log | while read serverline || read... (8 Replies)
Hi,
Here is my question:
I want a shell script which I name as 'del', and can be used as del(string).
when run del(string), it will delete several directories at different locations in my system,like:
rm -fr /lustre/fs/scratch/user/$string
rm -fr /home/user/$string
rm -fr... (4 Replies)
Suppose I have a program that I've written that accepts input, ie this C++ program:
#include <iostream>
using namespace std;
int main()
{
cout << "Enter something:" << endl;
int x;
cin >> x;
cout << "You entered data" << endl;
}
Suppose that I have a text file,... (5 Replies)
Discussion started by: Chris J
5 Replies
LEARN ABOUT ULTRIX
setbuf
setbuf(3s)setbuf(3s)Name
setbuf, setbuffer, setlinebuf, setvbuf - assign buffering to a stream
Syntax
#include <stdio.h>
void setbuf(stream, buf)
FILE *stream;
char *buf;
void setbuffer(stream, buf, size)
FILE *stream;
char *buf;
int size;
void setlinebuf(stream)
FILE *stream;
int setvbuf(stream, buf, type, size)
FILE *stream;
char *buf;
int type; size_t size;
Description
The three types of buffering available are unbuffered, block buffered, and line buffered. When an output stream is unbuffered, information
appears on the destination file or terminal as soon as written; when it is block buffered many characters are saved up and written as a
block; when it is line buffered characters are saved up until a new line is encountered or input is read from stdin. The routine may be
used to force the block out early. Normally all files are block buffered. For further information, see A buffer is obtained from upon the
first or on the file. If the standard stream stdout refers to a terminal it is line buffered. The standard stream stderr is always
unbuffered.
The routine is used after a stream has been opened but before it is read or written. The character array buf is used instead of an auto-
matically allocated buffer. If buf is the constant pointer NULL, input/output will be completely unbuffered. A manifest constant BUFSIZ
tells how big an array is needed:
char buf[BUFSIZ];
The routine, an alternate form of is used after a stream has been opened but before it is read or written. The character array buf whose
size is determined by the size argument is used instead of an automatically allocated buffer. If buf is the constant pointer NULL,
input/output will be completely unbuffered.
The routine is used to change stdout or stderr from block buffered or unbuffered to line buffered. Unlike and it can be used at any time
that the file descriptor is active.
The routine may be used after a stream has been opened but before it is read or written. Type determines how stream will be buffered.
Legal values for type, defined in stdio.h are:
_IOFBF causes input/output to be fully buffered.
_IOLBF causes output to be line buffered; the buffer will be flushed when a new line is written, the buffer is full, or input is
requested.
_IONBF causes input/output to be completely unbuffered.
If buf is not the NULL pointer, the array it points to will be used for buffering, instead of an automatically allocated buffer. The size
specifies the size of the buffer to be used. The constant BUFSIZ in <stdio.h> is suggested as a good buffer size. If input/output is
unbuffered, buf and size are ignored.
By default, output to a terminal is line buffered and all other input/output is fully buffered.
A file can be changed from unbuffered or line buffered to block buffered by using For further information, see A file can be changed from
block buffered or line buffered to unbuffered by using followed by with a buffer argument of NULL.
Restrictions
The standard error stream should be line buffered by default.
The and functions are not portable to non 4.2 BSD versions of UNIX.
See Alsomalloc(3), fclose(3s), fopen(3s), fread(3s), getc(3s), printf(3s), putc(3s), puts(3s).
setbuf(3s)