replace numeric date format in sql postgresql file

I have a postgresql dump file which I want to import to version 8.3
I need to replace numeric data in this file with format "10-25-2004" to "25-10-2004".
i.e. the middle  field needs to be swapped with the first field.

How do I do this in linux?

1TsuppAsked:
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omarfaridCommented:
can you show sample file content?
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cjl7freelance for hireCommented:
Hi,

This is one way...

echo "10-25-2004" |perl -pe 's/(..)-(..)-(....)/$2-$1-$3/g'

And if you have a dump-file

cat file |perl -pe 's/(..)-(..)-(....)/$2-$1-$3/g'

If you know it's only this specific date and nothing else you could use sed (sed -i 's/10-25-2004/25-10-2004/g' <file>)


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1TsuppAuthor Commented:
sample data line will be:
mrproper      Can Music Support Interfaces to Complex Databases?      cpchr      Euromicro - 1997, Frontiers of Information Technology      06-13-1997      Proper      D.      DAta2      J.L.      Long      F.W                  \N      \N      \N      \N      \N      \N            \N      \N      \N                  261      \N      Budapest      Hungary      y      \N      \N            Published      \N      \N      \N      \N      \N      \N

I want to take the field in this instance 06-13-1997 and swap it to 13-06-1997 leaving the rest of the line unaltered.
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1TsuppAuthor Commented:
I've just tried cat file |perl -pe 's/(..)-(..)-(....)/$2-$1-$3/g'
and it appears to have partially worked however I have just realised the data is a little more complex.

The data line:

author      Applications of Virtual Reality      bked            01-01-1995      Author1      R.A.      Bloggs      H.      Vince      J.A.                  \N      0-12-227755-4      \N      \N      \N      \N      328      \N                              286      \N      \N      \N      \N      Academic Press      \N            Published      \N      \N      \N      \N      \N      \N

is now:

author      Applications of Virtual Reality      bked            01-01-1995      Author1      R.A.      Bloggs      H.      Vince      J.A.                  \N      0-227755-4      \N      \N      \N      \N      328      \N                              286      \N      \N      \N      \N      Academic Press      \N            Published      \N      \N      \N      \N      \N      \N

i.e. 0-12-227755-4 has changed to 0-227755-4
I want to leave this unchanged so the test needs to be strictly:  
Test for  first2 digit numeric-second2 digit numeric-4 digit numeric
Swap second2 digit numeric-first2 digit numeric-4 digit numeric

Any clues?

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joolsCommented:
Can you re-export the database in the right date format?

Sorry, had to ask...
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earth man2Commented:
http://www.postgresql.org/docs/8.3/static/runtime-config-client.html#GUC-DATESTYLE
prepend data in file with a set command ie

SET DATESTYLE iso, mdy;
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bishilloCommented:
the "SET DATESTYLE iso, mdy;" is the best way to go. You should use same configuration for import/import, in dates and also in charset (iso-8859-1, utf-8...).

But in perl you should use [0-9] (\d for decimal is also valid) iinstead of dot. Dot matches every character, with [0-9] or \d just numbers, so it won't broke other data.

cat file | perl -pe 's/(\d{2})-(\d{2})-(\d{4})/$2-$1-$3/g'
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cjl7freelance for hireCommented:
Working with regular expressions is always tricky. It's probably better to get the data into the database and then manipulate it. After all that's one thing a SQL server is good at! ;)
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1TsuppAuthor Commented:
cat file | perl -pe 's/(\d{2})-(\d{2})-(\d{4})/$2-$1-$3/g' works without altering other data.
I cannot use "SET DATESTYLE iso, mdy;" - i'm migrating data from postgres 6.5 to 8.3
and massaging the 6.5 pg_dump file.
Thanks to all for your help.

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1TsuppAuthor Commented:
Thanks
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