10 More Discussions You Might Find Interesting
1. Programming
Hi guys, I'm having some problem here, I'm studying pipes, and i want to create a shell in C and at this point a don't want to use semaphores, instead I want to use tricks. Straight to the doubt: I've a parent and a child process, and both of them has some code to execute, and the child process... (5 Replies)
Discussion started by: pharaoh
5 Replies
2. UNIX for Dummies Questions & Answers
Hey all, I need a command line that creates a new file named whatever, say stuff.txt in the current working directory which contains the number of directories in the current working directory, followed by the number of empty files in the current working directory, followed by the name of the... (2 Replies)
Discussion started by: corpsegrinder
2 Replies
3. UNIX for Dummies Questions & Answers
I'm writing a PHP script which will take a given media file and convert it into a flash (flv) file. In addition to this, once the flv file has been generated I create two thumbnails (of different sizes) from the newly generated flv file.
In order to do this I'm calling ffmpeg from the command... (4 Replies)
Discussion started by: phatphug
4 Replies
4. Programming
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <sys/wait.h>
#include <sys/types.h>
#include <stdint.h>
#define LINE_MAX 80
int main()
{
pid_t pid, pid1;
char line;
char *lines;
char *key, *data,... (2 Replies)
Discussion started by: p00ndawg
2 Replies
5. Shell Programming and Scripting
Hello,
I would like to pipe two variables into awk, but I don't know how to do.
Each variable, "a" and "b", are in fact a list of data. They are not files.
So to get awk to work with it I am using:
echo $a | awk 'FNR==NR{print $1}FNR!=NR{print $4}'
The above works, but when I am... (5 Replies)
Discussion started by: jolecanard
5 Replies
6. Shell Programming and Scripting
Hi,
I have a file 'imei_01.txt' having the following contents:
$ cat imei_01.txt
a123456
bbr22135
yet223
where I want to check whether the expression 'first single alphabet followed by 6 digits' is present in the file (here it is the first record 'a123456')
I am using the following... (5 Replies)
Discussion started by: royalibrahim
5 Replies
7. UNIX for Advanced & Expert Users
Hi,
I am thinking about writing a log daemon for a multi-processed ksh application (yes - I know that high-level language would be a better option).
My question is as follows:
If many processes (many scripts) will try writing to a single log file:
print "message" > common.log
Will it work or... (2 Replies)
Discussion started by: adderek
2 Replies
8. Shell Programming and Scripting
Hello All,
I have a list of short programs (over 200) to run and it is a hassle to sit and execute each one of them one after the other.
What I'd like to know is if it was possible to create one file which would list all these commands and all I need to do is to execute this one single file.... (2 Replies)
Discussion started by: zenla15
2 Replies
9. Programming
Hi all,
I'm trying to write a program that has some data it wants to send through a filter program(in this case tr), and then recieve the output from that filter program. The way I'm trying to do it is by setting up two pipes between the programs and piping the data in through one pipe and back... (2 Replies)
Discussion started by: bwgoudey
2 Replies
10. Filesystems, Disks and Memory
Hello!
How I can increase or decrease predefined pipe buffer size?
System FreeBSD 4.9 and RedHat Linux 9.0
Thanks! (1 Reply)
Discussion started by: Jus
1 Replies