Sets the frequency governor for all CPUs on the system

gov.c

/*Compile with gcc -Wall -s gov.c -o gov
  gov by The Lightning Stalker 8/26/2017
  pops open cpufreq-set for each CPU and sets governor*/

#include <stdio.h>
#include <string.h>

#define NUMCPUS 12 // number of CPUs on the system ($ lscpu)

int main(int argc, char *argv[])
{
  char command[33]  = "cpufreq-set -c ## -g powersave\0\0\0";
  char governor[12] = "powersave\0\0\0"; // default governor is powersave
  char numcpu[3]    = "00\0";
  FILE *stream;

  if ( argc >= 2 ) strcpy(governor, "performance\0"); // CLI options were passed
  strcpy(&command[21], governor);

   for(int cpu = 0; cpu < NUMCPUS; cpu++)
   {
     sprintf(numcpu, "%02i", cpu);
     // put 2 chars from numberstr into filename a position 15
     strncpy(&command[15], numcpu, 2);   // don't copy the trailing null
     //printf("%s\n", command);          // display command for debugging
     stream = popen(command, "r");       // run cpufreq-set as read
                                         // and ignore output
   }
   if ( pclose(stream) != 0 ) puts("Something went wrong.  Are you root?");
   else printf("All CPUs set to \'%s\' governor\n", governor);

   return(0);
}