Help: how to call fork() in shell script? New to linux

10 More Discussions You Might Find Interesting

1. Ubuntu

Help: how to call fork() in shell script? New to linux

Hi, I'm writing a shell script where I want to call fork(). However I wrote like this "var=fork()" in c style and got this error: "syntax error near unexpected token `(' " How could I call fork() in shell script? Thanks in advance.

2. Shell Programming and Scripting

how to suppress the status of fork in shell script

When command is executed by forking, the console displays the status of that command. I want to suppress it.. how to do it ? Example: var1=`date` & echo "hello world"; output: hello world + Done var1=`date` I want to suppress the second line "+ Done var1=`date`". I...

3. UNIX for Advanced & Expert Users

Doubt with fork() system call

Hi I wrote a simple fork program to illustrate the fork() system cal. here it is #include<stdio.h> #include<sys/stat.h> #include<sys/types.h> main() { int flag; flag=fork(); if(flag==0) { printf("Child \n"); printf("Process id= %d\n",getpid()); ...

4. Programming

Problem with execution of fork system call if i use \n

hi all, i tried the following source codes: fork1.c: main() { printf("demo of fork\n"); fork(); printf("hello"); } output: demo of fork hello hello fork2.c: main()

5. Shell Programming and Scripting

fork system call and \n

hi, i tried the following source codes: fork1.c: main() { printf("demo of fork\n"); fork(); printf("hello"); } output: demo of fork hello hello fork2.c: main() { printf("demo of fork");

6. Homework & Coursework Questions

fork system call understanding

Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted! 1. The problem statement, all variables and given/known data: i have a problem in understanding the behaviour of fork . i understood fork as to create a new process and...

7. UNIX for Dummies Questions & Answers

fork system call

Hi folks, I want to know how this below program works? #include <stdio.h> int main() { printf("A\n"); fork(); printf("B\n"); fork(); fork(); printf("D\n"); fork(); printf("C\n"); } This is just for example. How this type of programs where fork is used many places, how the...

8. UNIX for Dummies Questions & Answers

fork() system call

Can anyone explain me what really happens when a system call fork() is called ? I like to know what happens internally. Thanks in Advance. - Arun

9. Programming

Fork() system call time?

One more question. How can i calculate the time that system needs to make fork() system call? I need to make it with times function but i really don't know how. :(

10. UNIX for Advanced & Expert Users

URGENT Help required regarding the use of FORK system call

I desperately wanted one of the UNIX Gurus to help me resolve my problem asap(I have to deliver the code to the client by Monday 08-oct). I have a file with around 5 million records (50 lakhs). Now my original process was taking around 30 hours to read the complete file, process each and every...

LEARN ABOUT FREEBSD

system

SYSTEM(3)						   BSD Library Functions Manual 						 SYSTEM(3)

NAME

     system -- pass a command to the shell

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <stdlib.h>

     int
     system(const char *string);

DESCRIPTION

     The system() function hands the argument string to the command interpreter sh(1).	The calling process waits for the shell to finish execut-
     ing the command, ignoring SIGINT and SIGQUIT, and blocking SIGCHLD.

     If string is a NULL pointer, system() will return non-zero if the command interpreter sh(1) is available, and zero if it is not.

RETURN VALUES

     The system() function returns the exit status of the shell as returned by waitpid(2), or -1 if an error occurred when invoking fork(2) or
     waitpid(2).  A return value of 127 means the execution of the shell failed.

SEE ALSO

     sh(1), execve(2), fork(2), waitpid(2), popen(3)

STANDARDS

     The system() function conforms to ISO/IEC 9899:1990 (``ISO C90'') and is expected to be IEEE Std 1003.2 (``POSIX.2'') compatible.

BSD
								   June 4, 1993 							       BSD

Shell Programming and Scripting