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System Software Lab Programs ( UNIX Programs ) – 1B

// March 4th, 2009 // Engineering, Unix and System Software Lab // Written by sandeephegdecloseAuthor: sandeephegde Name: Sandeep Hegde
Email: sandeephegde88@gmail.com
Site: http://www.sandeephegde.me
About: See Authors Posts (119)

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Subject : System Software Laboratory

Branch : Information Science & Engineering

Semester : 6

University : VTU

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PART -B

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1. b) C program that creates a child process to read commands from the standard input and execute them (a minimal implementation of a shell – like program). You can assume that no arguments will be passed to the commands to be executed.

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#include,stdio.h>

#include<unistd.h>

#include<string.h>

main()

{

int pid,n,i;

char cmd[30];

printf(“\n Enter the number of commands : “);

scanf(“%d”,&n);

pid=fork();

system(“clear”);

if(!pid)

{

for(i=0;i<n;i++)

{

printf(“\n Enter the command : “);

scanf(“%s”,cmd);

system(cmd);

}

}

else

{

wait(100);

exit(1);

}

printf(“\n Parent process is completed..\n\n”);

return 0;

}

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