Armstrong number in PHP
Armstrong number is a number that is equal to the sum of cubes of its digits. For example 0, 1, 153, 370, 371 and 407 are the Armstrong numbers. Let’s try to…
Implement transmission of ping messages/trace route over a network topology
#Create a simulator object set ns [new Simulator] #Open a nam trace file set nf [open PING.nam w] $ns namtrace-all $nf #Open a trace file set nt [open PING.tr w]…
Implement three nodes point – to – point network with duplex links between them & Set the queue size, vary the bandwidth and find the number of packets dropped
#Create a simulator object set ns [new Simulator] #Open a trace file set nt [open lab1.tr w] $ns trace-all $nt #Open a nam trace file set …
C program which illustrates sending signal from one process to another by using kill API. Also check if the program have permission to send the signal or not
#include#include#include#include#include#includevoid sig_handler(int num){printf("nChild Sent a signal to parent:%dn",num);signal(SIGALRM,SIG_DFL);}int main(){int status;system("clear");printf("n--------Signal Handling Across Processes----------n");switch(fork()){case -1:perror("nFork Failed...n");exit(1);break;case 0:alarm(3);kill(getppid(),SIGALRM);//signal(SIGALRM,sig_handler);printf("nIts Child Processn");sleep(5);break;default:signal(SIGALRM,sig_handler);wait(&status);printf("nIts Parent Processn");}return 0;}
C Program to register signal handler for SIGTERM and when it receives the signal, the program should print some information about the origin of the signal
#include #include #include #include struct sigaction act; void sighandler(int signum, siginfo_t *info, void *ptr) { printf("Received signal %dn", signum); printf("Signal originates from process %lun", (unsigned long)info->si_pid); } int main() {…
C program that accepts a valid directory names as a command line argument and lists all the files in the given directory as well as all the subsequent sub directories
#include #include #include int myfun(const char *pathname,const struct stat *statptr,int type); int main(int argc,char *argv[]) { nftw(argv[1],myfun,0,0); exit(0); } int myfun(const char *pathname,const struct stat *statptr,int type) { if(type==FTW_F) printf("nfile…
C program that creates a child process to read commands from the standard input
#include #include #include int main() { int pid,status; char comd[20];pid=fork(); if(pid==0) { printf("child processn"); while(strcmp(comd,"exit")!=0) { printf("[user@localhost~]$"); gets(comd); system(comd); } exit(0); } else { wait(&status); printf("parent processn"); } } ****************************************…
Shell script that performs following string handling operations i) Calculate the length of the string ii) locate a position of a character in a string iii) extract last three characters from string
#!/bin/sh str=tanu echo “string:$str” echo “lengh of string:” z=`expr “$str”:’.*’` echo $z echo “substring is” z=`expr “$str”:’.*(…)’` echo $z echo “position of character n is” z=`expr “$str”:’[^n]*n’` echo $z *******************…
Shell script that accepts path names and creates all the components in that path names as directories
#!/bin/sh if [ $# -ne 1 ] then echo " no arguments " exit fi curdir=`pwd` for dir in `echo $1 | tr '/' ' ' ` do if […
Shell Program that takes the any number of arguments and print them in same order and in reverse order with suitable messages
echo "program name: $0" if [ $# -eq 0 ] then exit fi echo "no: of arguments: $#" echo "the input arguments are" num=1 for i in "$@" do echo…
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