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  È磺
  #include<stdio.h>
  //*******dtest.c*******
  int main()
  {
    #ifdef DEBUG
      printf("Debug output......\n");
    #endif
    printf("Main function ended!\n";
  }
  ÔËÐУº
  $ cc -o dtest dtest.c
  $ ./dtest
  Main function ended!
  $ rm dtest
  $ cc -o dtest  -DDEBUG dtest.c
  $ ./dtest
   Debug output......
   Main function ended!
  ͨ¹ýÒÔÉÏʾÀý£¬ÄãÓ¦¸ÃÃ÷°×ÁË-DDEBUG±ê¼ÇµÄÓ÷¨Á˰ɣ¬ºÇºÇ~~~Ò²ÐíÄã»áÏ룬Èç¹ûÎÒÓкü¸¶Îµ÷ÊÔ´úÂ룬¶øÎÒÏ£Íû¸ù¾ÝÐèҪÿ´ÎÑ¡ÔñÏàÓ¦µÄÒ»¶ÎÀ´ÔËÐУ¬ÕâÊÇ·ñÄÜʵÏÖÄØ£¿²»ÅÂ×ö²»µ½£¬¾ÍÅÂÏë²»µ½¡£ÊÂʵÉÏÎÒÃÇ¿ÉÒÔ·½±ãµÄʵÏÖÕâÖÖ¹¹Ï룬ÈçÏ£º
  #define BASIC_DEBUG 1
  #define EXTRA_DEBUG 2
  #define SUPER_DEBUG 4
  //code 1
  # if (DEBUG & BASIC_DEBUG £©
    printf¡£¡£¡£
  #endif
  //code 2
   # if (DEBUG & EXTRA_DEBUG £©
    printf¡£¡£¡£
  #endif
 
  //code 3
   # if (DEBUG & SUPER_DEBUG £©
    printf¡£¡£¡£
  #endif
  ÉÏÊö´úÂëÖÐÎÒÃÇ×Ô¶¨ÒåÁ˼¸¸öºê±äÁ¿£¬Í¨¹ý"&“À´¾ö¶¨´úÂë¶ÎµÄÖ´ÐÐÓë·ñ¡£ÎÒÃÇÖªµÀ”&“Ϊ°´Î»È¡ÓàÔËËã·û£¬ËùÒÔµ±DEBUGµÄֵΪ1ʱ£¬Ö»ÓÐcode 1»áÖ´ÐУ¬µ±DEBUGµÄֵΪ2ʱ£¬Ö»ÓÐcode 2»áÖ´ÐУ¬¶øµ±DEBUGµÄֵΪ3ʱ£¬code 1ºÍcode 2¶¼»áÖ´ÐУ¬ÒÀ´ÎÀàÍÆ¡£¡£¡£¿ÉÊÇÎÒÃÇÈçºÎ¸ù¾ÝÐèÒªÉèÖÃDEBUGµÄֵĨ£¿Õ⻹µÃ¿´-DDEBUG±ê¼Ç£¬ÔÚÃüÁîÌáʾ·ûÏÂÖ±½Ó¸ø-DDEBUG¸³Öµ¾ÍOKÁË£¬Èçcc -o dtest 
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1. Q. How do you find out the processes that are currently running or a particular user?
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2. Q. How do you kill a process?
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