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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!
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  #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
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1. Q. How do you find out the processes that are currently running or a particular user?
   A. ps -au Myname   (-u by effective user ID (supports names)) (a - all users)
2. Q. How do you kill a process?
   A. kill -9  8 (process_id 8) or kill -9  %7  ( ......

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