CentOS - Apr 2016 - Semi-OT: awk

This is odd, and annoying. CentOS 6, current. Here's my awk script:

{
   room = substr($0, 48, 10);
   arr[$2,room,$1] = $0;
}
END {
  for ( i in arr ) {
     for ( j in arr[i] ) {
        for ( k in arr[i][j] ) {
            print arr[i][j][k];
        }
     }
   }
}

And when I run it, it complains
 awk -f awksort proplist7
awk: awksort:7:      for ( j in arr[i] ) {
awk: awksort:7:                    ^ syntax error
awk: awksort:8:         for ( k in arr[i,j] ) {
awk: awksort:8:                       ^ syntax error
awk: awksort:9:             print arr[i][j][k];
awk: awksort:9:                         ^ syntax error

which makes no sense - I've done this a million times. Am I missing
something, or is this a bug?

     mark

On Fri, Apr 29, 2016 at 10:31:51AM -0400, m.roth at 5-cent.us
wrote:
> This is odd, and annoying. CentOS 6, current. Here's my awk script:
> 
> {
>    room = substr($0, 48, 10);
>    arr[$2,room,$1] = $0;
> }
> END {
>   for ( i in arr ) {
>      for ( j in arr[i] ) {
>         for ( k in arr[i][j] ) {
>             print arr[i][j][k];
>         }
>      }
>    }
> }
> 
Note the last sentence in this paragraph from the gawk manpage:

   The in construct may also be used in a for loop to iterate over
   all the elements of an array.  However, the (i, j) in array
   construct only works in tests, not in for loops.

jl
-- 
Jon H. LaBadie                 jon at jgcomp.com
 11226 South Shore Rd.          (703) 787-0688 (H)
 Reston, VA  20190              (703) 935-6720 (C)

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On 29/04/16 18:14, Jon LaBadie wrote:
> On Fri, Apr 29, 2016 at 10:31:51AM -0400, m.roth at 5-cent.us wrote:
>> This is odd, and annoying. CentOS 6, current. Here's my awk
>> script:
>> 
>> { room = substr($0, 48, 10); arr[$2,room,$1] = $0; } END { for (
>> i in arr ) { for ( j in arr[i] ) { for ( k in arr[i][j] ) { print
>> arr[i][j][k]; } } } }
>> 
> 
> Note the last sentence in this paragraph from the gawk manpage:
> 
> The in construct may also be used in a for loop to iterate over all
> the elements of an array.  However, the (i, j) in array construct
> only works in tests, not in for loops.
> 
> jl
> 
I modelled your problem, just changing line 2 to "room = $3".  The
data file was:
1 2 3
4 5 6
7 8 9

The problem is in the line ( i in arr ).  i will be "1SUBSEP2SUBSEP3",
which makes a nonsense of the rest of the code.

Using

END {
  for ( a in arr ) {
     split( a, a2, SUBSEP )
     print a2[1], a2[2], a2[3]
   }
}

I get a sensible output.  You'll have to take it from here.
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