Counting files in a given directory Post: 302472142

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Top Forums UNIX for Advanced & Expert Users Counting files in a given directory Post 302472142 by Corona688 on Tuesday 16th of November 2010 11:30:09 AM

11-16-2010

Registered User

Anything that counts files will have to do so the same way: checking directory entries. So there's no special "faster ls". (If there was, why wouldn't we use it for everything?)

If you can compile on this machine, this program can provide a running total, updated once a second:

Code:

#include <stdio.h>
#include <time.h>

int lines=0;

int main(void)
{
	time_t timer=time(NULL);
	char buf[16384];
	while(fgets(buf, 16384, stdin) != NULL)
	{
		lines++;

		if((time(NULL)-timer) > 1)
		{
			fprintf(stderr, "\r%d", lines);
			timer=time(NULL);
		}
	}

	printf("%d\n", lines);

	return(0);
}

It only reads from stdin.

---------- Post updated at 10:30 AM ---------- Previous update was at 10:26 AM ----------

Quote:

Originally Posted by verdepollo

I'm still trying to figure out how to count those files. It would be enough for me if I could find out an approximate value, and not the exact number.

Very approximate since it includes directory entries as well, but since counting 4 million files is going to be hard, it might have to do.

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LEARN ABOUT CENTOS

sdl_settimer

SDL_SetTimer(3) 						 SDL API Reference						   SDL_SetTimer(3)

NAME

       SDL_SetTimer - Set a callback to run after the specified number of milliseconds has elapsed.

SYNOPSIS

       #include "SDL.h"

       int SDL_SetTimer(Uint32 interval, SDL_TimerCallback callback);

CALLBACK

       /* Function prototype for the timer callback function */ typedef Uint32 (*SDL_TimerCallback)(Uint32 interval);

DESCRIPTION

       Set  a  callback  to run after the specified number of milliseconds has elapsed. The callback function is passed the current timer interval
       and returns the next timer interval. If the returned value is the same as the one passed in, the periodic alarm continues, otherwise a  new
       alarm is scheduled.

       To cancel a currently running timer, call SDL_SetTimer(0, NULL);

       The timer callback function may run in a different thread than your main constant, and so shouldn't call any functions from within itself.

       The  maximum  resolution  of this timer is 10 ms, which means that if you request a 16 ms timer, your callback will run approximately 20 ms
       later on an unloaded system. If you wanted to set a flag signaling a frame update at 30 frames per second (every 33 ms), you  might  set  a
       timer for 30 ms (see example below).

       If you use this function, you need to pass SDL_INIT_TIMER to SDL_Init().

	      Note:

	      This  function  is  kept for compatibility but has been superseded by the new timer functions SDL_AddTimer and SDL_RemoveTimer which
	      support multiple timers.

EXAMPLES

       SDL_SetTimer((33/10)*10, my_callback);

SEE ALSO

       SDL_AddTimer

SDL
							      Tue 11 Sep 2001, 23:01						   SDL_SetTimer(3)