UNIX for Dummies Questions & Answers

I am having a file, around 500 lines. which contains one letter words, two letters words,...and so on(up to 15 letter words and words are not seprated by line). I need to compare all 1 letter words with 3,4,5 and 6 letters word, all 2 letters words with 2,3,4 and 5 letters words and all 3 letters word with 3 and 4 letters words. For this i wrote a program in C and shell script, my logic is

*)use awk and shell script to create six different files. file1 for 1 letter words, file2 for 2 letters words ..so on and file6 for six letters words.

*) In every file first line contains number of words in that file.

*)read each file line by line and since i already know the number of words in the file assign dynamic memory to store them in 2D char arrays.

*)For each word in 2d arrays compare as mentioned above.

part of my code:

Code:

/*for 3*/
for(i=0;i<length[2];i++) /*length[2] contains number of 3 letter words
{
 
  /*3x3*/
 for(j=i;j<length[2];j++)
 {
    
     for(k=0;k<4;k++)
     {              
            strcpy(temp1,file3[i]);             /*file3[i] is pointer to ith 3 letter word*/
            strcpy(temp2,file3[j]);
            sprintf(temp3,"%d",2*k);
            if(strcmp(crypt(temp4=strcat(temp1,strcat(temp3,temp2)),salt),encrypt)!=0)
             {
               if( strcmp(crypt(temp4=strcat(temp2,strcat(temp3,temp1)),salt),encrypt)==0)
                 {
                          printf("%s\n",temp4);
                          exit(0);
    }
             }
      else 
              { 
                printf("%s\n",temp4);
                exit(0);
       }   
       }
  }/*3x3 end*/
/*3x4*/
for(j=i;j<length[3];j++)
 {.......

/*------------------------------------------------------------------*/
But it is to slow. Can anyone suggest me better way of doing this. Thanks in advance.

brute-forcing crypt() isn't meant to be fast, why are you doing this?

Iam having a encrypted password and a file containing set of words.combination of those words give password.

Don't know any way to make crypt() faster. It was designed to be resource intensive precisely to make what you're doing more difficult.

If your CPU has two cores, you could run two instances of the program over different ranges of j and they'd compute their results simultaneously.