Answer Posted / rahul magdum

#include sys/types.h
#include unistd.h
#include sys/stat.h

main()
{
Int pid=fork();
Int fd=creat("op.txt",S_IRWXU);
If(pid!=0 && pid!=-1)
{
close(1); // stdout
dup(fd); // replace file descriptor
execlp("ls","ls","-l",null);
close(fd);

}
}

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