Importing/Exporting

I am new to doing DBA activities.  I am trying to
write a bash script that will copy the value of a
specific field  within a table in a postgres database
on one server and import the value of that field into
a table in a mysql database on a separate server.  I
am not real familiar with sql statements yet so I was
hoping that someone could give me some advice.

My initial thoughts would be to copy the output of the
select statement to a file, copy the value that I need
from the file to a variable, then import that variable
into the appropriate field in the mysql database. 
Where I am getting hung up is trying to export the
value of a specific field to a file.

Is there an easier way of doing this?

Thanks,

Nathan Hill 

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