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Computer Science Engineering Database Systems Difficulty: Medium

Which of the following meta-character is used in command substitution? What is the output of this program? #include<stdio.h> #include<stdlib.h> int main() { int fd[2]; int child; char buff[6]; if(pipe(fd) != 0) perror("pipe"); child=fork(); switch(child){ case -1 : perror("fork"); exit(1); case 0 : if (write(fd[1],"Linux",6) != 6) perror("write"); break; default : read(fd[0],buff,6); printf("%s\n",buff); break; } return 0; } The nucleus of the copper atom contains how many protons? In SQL, which command is used to make permanent changes made by statements issue since the beginning of a transaction? This program will print the #include<stdio.h> #include<unistd.h> int main() { long int value; value = pathconf("/home/example",_PC_NAME_MAX); printf("%ld\n",value); return 0; }