This perl script is an old piece of code that will create a Windows version text string. I am sure someone might find this useful. #!/usr/bin/perl use warnings; @t = localtime(time()); $yr = ($t[5] + 1900) -1; $sr = int(( $t [4]/4) + 1); $v = int("$t[7]$t[2]$t[1]$t[0]"*((rand(rand(10)…
Read MoreFunny and cool Linux tips 1337 or Leet in the UNIX time. -01:44:57– gordon@deusexmachina [~]$ date +%s 1337096699-01:44:57– gordon@deusexmachina [~]$ date +%s 1337096699 The missing days in 1752. I have mentioned this before, but it is worth mentioning again. -01:45:31– gordon@deusexmachina [~]$ cal 9 1752 September 1752 Su Mo Tu…
Read MoreThis is how to actually count the lines of code in your C project on Linux. Some people advocate using wc -l, but that would not suit our purposes. The cloc utility is able to do this and more. Firstly, install this utility. sudo apt install clocsudo apt install cloc…
Read MoreNot a bad little program, and I got the code to work first time, not bad. Writing code in standard C is better than C++ or C#, the old C language is still the best. The whole Linux kernel is written in C and if it is good enough for…
Read MoreI think I may have posted this before, but this is a little program I am working on that writes a text string to a file. I have got it to work perfectly and it compiles without errors using gcc -Wall. /* * This program is free software; you can…
Read MoreThis program will return the IP address of a specified network interface. Use the –ip parameter to get the IP. For example, this will show the IP address of an Ethernet interface: my-ip –ip eth0. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15…
Read MoreThis is a simple random number example in C. This will print a random number from 1 – 64. #include <stdio.h> #include <stdlib.h> int main (void) { srand(time(NULL)); int r = rand() % 64; printf("Random INT: %i\n", r); return 0; }#include <stdio.h> #include <stdlib.h> int main…
Read MoreHow to define a string and print it out with the printf() function. #include <stdio.h> /* Defining a global string. */ #define hi "Hello Sire." int main(void) { /* Printing out the string. */ printf("%s\n", hi); return 0; }#include <stdio.h> /* Defining a global string. */…
Read MoreDo a simple function call in C. This code snippet shows how to do this This simple C code snippet shows how to do a function call in C. This calls the hi() function and runs it in main(). Very simple but useful code. And this does not need to…
Read MoreThis code will pick a random word from the x[] array and include it in the printed string. This program will also get your current Linux username to customize the output. I am sure this code would be very useful to someone who wants to know how to handle arrays…
Read MoreThis code will print the contents of a file to the terminal. Feel free to use this in your own projects if you wish. #include <stdio.h> #define MEM "/proc/diskstats" int main (void) { FILE *g; char Meminfo[40]; g = fopen(MEM, "r"); if(!g) { printf ("Sorry, I cannot…
Read MoreThis loop I wrote in C enables if statements inside a loop. This could be a useful thing to know. #include <stdio.h> int main(void) { int k; for (k = 0; k < 16; k++) { printf("* *\n"); if (k == 4 || k == 12) { printf("\n\t\t-\n");…
Read MoreThis is a very simple Hello World program that you can write in C. int main (void) { write (1, "Hello World\n", 14); return 0; }int main (void) { write (1, "Hello World\n", 14); return 0; } Just compile the program like this: localhost% cc minimal.c -o small minimal.c:…
Read MoreThis code sample will render a spiral on your terminal when you compile and execute it. Very interesting indeed. #include <sstream> #include <iostream> #include <string> std::string rle = "32 2@14 1n16 11@9 2@10 1n13 3@13 3@8 1@7 1n10 2@21 2@7 1@5 1n7 2@27 1@6 1@4 " "1n6 1@10 10@10…
Read MoreThis code prints out a tick sign using asterisks. I tested this code on Fedora 19 and gcc 4.8 and it compiles without any problems. #include <iostream> #include <iomanip> using std::cout; int main() { cout<<std::setw(8)<<"*"<<"n"; cout<<std::setw(7)<<"*"<<"n"; cout<<std::setw(6)<<"*"<<"n"; cout<<"* *"<<"n"<<"* *"<<"n"<<"*"; cout<< "n"; return 0; }#include…
Read Morehttp://gentoomen.org/tutorials/resources.html. The gentoomen.org resources page. Very good list of links to various tutorials and help pages. http://tldp.org/LDP/abs/html/. The Advanced BASH scripting guide. ftp://ftp.vim.org/pub/vim/doc/book/vimbook-OPL.pdf. The VIM guideboook. http://stommel.tamu.edu/~baum/programming.html. 3000 useful guides to programming and Linux documentation and help pages. http://samizdat.mines.edu/howto/HowToBeAProgrammer.html. How to be a programmer. A short but comprehensive summary. http://www.psychocats.net/ubuntu/index….
Read MoreThis code sample shows how we are wrapping a printf() statement onto multiple lines using backslashes. #include "stdio.h" #define hello "Hello World." int main(int argc, char* argv[]) { printf("This is a very long sentence we are handing down\n"\ "Mr smith, do you have anything to say for yourself"\…
Read MoreThis programming trick is pretty cool, you can run the /bin/sh shell with a C program. The execve() function is useful for running a command within a C program and passing arguments to it, but I have replaced the arguments with NULL instead, that is what you put when you…
Read MoreA very obfuscated C program. typedef unsigned char t;t*F="%c",l[]="|\\/=_ \n](.\0(),*(.(=(}*.)[[*.",N=’\n’,* r;typedef(*H)();extern H Ar;Q(a){return(a|-a)>>31;}H S(c,a){return(H)(a&~c|(int )Ar&c);}extern t*ist;V(t*u){*u^=*u&2^(*u>>7)*185;}Z(t*u,t n){*u-=n;}e(t c,H h){ R(h,Q(* r^c));} I(){r=l +7-4*Q( getchar ()^*l); }R(H h, int c){Ar=S (c,h);- main() ;}P(){r ++;}z() { O(&N);} O(t*c){ printf( F,+*c); }T(){r= "This is not a function\n" ;}w(U){ U=Z(r,8 ); r-=~Q(* r/8-4); return…
Read MoreThis code snippet will run the date command. The execl() function is very useful for executing a command within your C program.You replace the NULL identifiers with any extra arguments to pass to the program. I prefer this over the system() function. #include <unistd.h> int main(void) { execl("/bin/date",…
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