Script to generate names

[Parv]

in message <20060204053659.GA2174 at holestein.holy.cow>,
wrote Parv thusly...
>
...
>   in_1="list1"
>   in_2="list2"
>   save="list3"
> 
>   [ -f "$save" ] && mv -f "$save" "$save--OLD"
>   {
>     while read word_1
>     do
>       while read word_2
>       do
>         printf "%s%s\n%s%s\n" \
>           "$word_1" "$word_2" \
>           "$word_2" "$word_1"
>
>         #  If all the possible combinations of all the words are
>         #  needed, remove or comment out the following "break".
>         break
>
>       done <"$in_2"
>     done <"$in_1"
>   } | sort -u >> "$save"
>



This is just broken at "break" as you would get combination of all
the words from "$in_1" only w/ the first word in "$in_2".  Remove
"break", and code works to generate all the possible combinations.

With "break" there, i was going for line wise pairs: word from line 1
from file 1 is paired w/ word from line 1 from file 2; word from
line 2 from file 1 paired w/ word from line 2 from file 2.

Of course, i forgot that that will cause the file 2 to be read from
the start.  What is needed is (involving use of fseek(3) & ftell(3))
...

 - open file 2 to read; save the current position, say in variable pos
 - inside the loop reading file 1, ...
  + read a word from line 2 starting at $pos
  + print word pairs
  + overwrite $pos w/ the current position in file 2


In any case, below is the version to generate all the pairs (does
not emits line wise pairs as stated above) ...

  #!/bin/sh

  in_1="list1"
  in_2="list2"
  save="list3"

  [ -f "$save" ] && mv -f "$save" "$save--OLD"
  {
    while read word_1
    do
      [ -z "$word_1" ] && continue

      while read word_2
      do
        [ -z "$word_2" ] && continue

        printf "%s%s\n%s%s\n" \
          "$word_1" "$word_2" \
          "$word_2" "$word_1"

      done <"$in_2"
    done <"$in_1"
  } | sort -u >> "$save"

  exit


  - Parv

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