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Old 11-17-2008, 04:33 PM   #1
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Registered: Nov 2008
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how to implement bidimensional arrays in awk?

hello everyone!!! a have some really big question marks and i hope u can give me some answers!
lets say i have an input file like this :
a b d g
a b c d e f g h
a c d f g h
a b c d g

i need to arrange the fields in an output file like this:
a b - d - - g -
a b c d e f g h
a - c d - f g h
a b c d - - g -

for this i came up with the script below :

awk ; { if(max_nf<NF)
END {for (i=1;i<=max_nr;i++)
{if (j==1 && v[j,i]!="a")
if (j==8 && v[j,i]!="a")
printf("%s ",v[j,i]);

Now, if i run the script on a Ubuntu system it works perfectly!
But i really HAVE to run it on a Solaris 5.9 and there is the problem!!!
Apparently i has "syntax errors" at assigning v[i,Nr]=$i, and at all "for" loops .
So, it's not a code problem, but a syntax one.
The thing is both systems have /usr/bin/awk and /usr/bin/nawk.
How can i find out what my version of awk can support and what it can't?
And more importantly, how do i rewrite the script in order to work on the Solaris?
Hope anyone cand help me
Old 11-17-2008, 06:08 PM   #2
Registered: Dec 2002
Location: Au
Distribution: Debian
Posts: 209

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Solaris has old school versions of such utilities.
Linux has the latest, greatest GNU versions.
On my system awk is symlinked to mawk for example.

If your script won't run under nawk then try gawk.
You can get gawk for solaris from

The awk lineage goes something like:
what's next, squawk???

WP has some history, if you're interested:

Last edited by yowi; 11-17-2008 at 06:12 PM.
Old 11-18-2008, 04:25 AM   #3
Registered: Jul 2008
Posts: 159

Rep: Reputation: 31
GNU awk does not have multi-dimensional arrays. It simulates multi-dimensional arrays by concatenating the indices and using the result as an index for a one-dimensional array. You can easily do this yourself by writing

array["1" "," "2"]
instead of

array[1, 2]
Old 11-18-2008, 07:54 AM   #4
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Registered: Nov 2008
Posts: 9

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thank u both for your suggestion...
i don't have permission to update the system , so i can't get gawk.
i will try instead simulating the multi dimensional array.
i'' be back to tell u if it worked.
thanks again!



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