12-30-2006
Instead of doing it the way you are currently doing it, you should construct a pipe using popen.
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
Hi
I have a C++ program that generates a lot of log information on the console, I need this output (printed using printf function) to go to a file since I will use crontab to schedule the job.
I know I can do this:
myprog > myfile
but I don't know how to enter this in crontab.
I use... (3 Replies)
Discussion started by: GMMike
3 Replies
2. Programming
The output I got for this pgm is "4 4 4 4".
Can any one help me to understand how I got this output.
Also please suggest me some links to learn about argumnets evaluation in C.
# include <stdio.h>
void func(int a, int b, int c, int d)
{
printf("%d %d %d %d", a, b, c, d);
}
int... (3 Replies)
Discussion started by: arunviswanath
3 Replies
3. UNIX for Dummies Questions & Answers
hi
I am very new to UNIX.
I need to retrieve data from a unix system and store it and display as output on a windows system.
Initiation of procedure is through JAVASCRIPT-based buttons on a HTML page.
This should cause a set of commands to run which colllect data from a unix based server and... (1 Reply)
Discussion started by: rossalyn_maxter
1 Replies
4. Programming
1 #include <fcntl.h>
2
3 main(int argc, char *argv)
4 {
5 char buf;
6 int fd, count = 0;
7
8 if (argc > 1)
9 fd = open(argv, O_RDONLY);
10 else
11 fd = 0; /* Use standard input */
12
13 while (read(fd, buf, 1) > 0) {
14 if (count < 5) write(1, buf, 1);
15 ... (3 Replies)
Discussion started by: bishweshwar
3 Replies
5. Shell Programming and Scripting
Hi,
I have following input file. I want to generate output file in specific format using shell program. The input file has atleast few thousands of lines, the below are some sample lines.
Input file:
"ORDER NO"|"ORDER AMT"|"LINE ITEM"|"LINE AMT"|"SALES COMMISION %"
ORD3456|5000|LIN345|30|25%... (8 Replies)
Discussion started by: dsubha
8 Replies
6. Programming
Hello All,
iam a new memeber today i joined this forum.
hope i will get help. the below program takes input strings and give reverse of input string.
&& mv /home/test1/programs/display /home/test1/programs/old
echo " Please enter the test "
read a
echo "$a" > file
wc -c file > file1
perl... (1 Reply)
Discussion started by: ameyrk
1 Replies
7. Shell Programming and Scripting
I am using AIX 5.3.0.0 ; I need a script to find out each remote AIX boxes
Hostname, Model name and Serial number in following format
Hostname Modelname SerialID
AIXMC01 IBM,7026-B80 IBM,0110BBA1F
AIXMC02 IBM,7026-H50 IBM,0110BBA56
AIXMC03 IBM,7026-H50 IBM,0110BBARR... (12 Replies)
Discussion started by: amir07
12 Replies
8. UNIX for Dummies Questions & Answers
Hi
Kindly provide me shell script on server to collect inbound connections, using port number on Linux. (4 Replies)
Discussion started by: adminhelp
4 Replies
9. Shell Programming and Scripting
Hi
I have the following C code
# cat test.c
#include <stdio.h>
main()
{
printf ("The output is : Power\n");
printf ("The output is : No Power\n");
}
The output of this C code is
# ./test
The output is : Power
The output is : No Power
Now i need to pass this outputs into a shell... (4 Replies)
Discussion started by: Priya Amaresh
4 Replies
10. Shell Programming and Scripting
I need the output of perldoc command collected to a file
# perldoc -l File::Scan::ClamAV > /usr/src/asas.txt
No documentation found for "File::Scan::ClamAV".
# cat /usr/src/asas.txt
# (2 Replies)
Discussion started by: anil510
2 Replies
LEARN ABOUT ULTRIX
pclose
popen(3) Library Functions Manual popen(3)
Name
popen, pclose - initiate I/O to/from a process
Syntax
#include <stdio.h>
FILE *popen(command, type)
char *command, *type;
pclose(stream)
FILE *stream;
Description
The arguments to are pointers to null-terminated strings containing respectively a shell command line and an I/O mode, either "r" for read-
ing or "w" for writing. It creates a pipe between the calling process and the command to be executed. The value returned is a stream
pointer that can be used (as appropriate) to write to the standard input of the command or read from its standard output.
A stream opened by should be closed by which waits for the associated process to terminate and returns the exit status of the command.
Because open files are shared, a type "r" command may be used as an input filter, and a type "w" as an output filter.
Diagnostics
The routine returns a null pointer if files or processes cannot be created, or the shell cannot be accessed.
The routine returns -1 if stream is not associated with a `popened' command.
Restrictions
Buffered reading before opening an input filter may leave the standard input of that filter mispositioned. Similar problems with an output
filter may be forestalled by careful buffer flushing, for instance, with For further information, see
The routine always calls and never calls
See Also
sh(1), pipe(2), wait(2), system(3), fclose(3s), fopen(3s)
popen(3)