How to create a variable in a bash script that contains the data from a postgres database

Question

I'm looking to create a script than can find a specific date/time based on a field in a database Currently i do it manually...

# psql gttvdb -U postgres
gttvdb=# select patch_date from version_history where version ='1.1.1';

What i need is to be able to reference that date as a variable in a bash script

#! /bin/sh
patchdate=$("select patch_date from version_history where version ='1.1.1';")
echo "last update was " $patchdate

Answer 1

Try this:

patchdate=` psql -t -q -c "select patch_date from version_history where version ='1.1.1'"`