store postgresql result in bash variable

Put the -c option just before its argument - the query. Mind also using the additional -t option to get just the tuple value. And of course, use the backticks (`) operator.

Using the -X option is also recommended, as sometimes a .psqlrc file might add some redundant output, as well as the -A option, which disables column aligning (whitespaces).

vartest=`psql -X -A -d $dbname -U $username -h localhost -p 5432 -t -c "SELECT gid FROM testtable WHERE aid='1'"`

Using -t option or --tuples-only will give you the rows only, so it will easier to store them in array variable (if the result from query more than one)

vartest =(`psql -t -d $dbname -U $username -c "SELECT gid FROM testtable WHERE aid='1';"`)echo $vartest

example:

query result

ubuntu@ratnakri:~$ psql -h localhost -p 5432 -t -U postgres -d postgres -c "select slot_name from pg_replication_slots"barmanbarman2

make it into array variable

    ubuntu@ratnakri:~$ RESULT=(`psql -h localhost -p 5432 -t -U postgres -d postgres -c "select slot_name from pg_replication_slots"`)    ubuntu@ratnakri:~$ echo ${RESULT[0]}    barman    ubuntu@ratnakri:~$ echo ${RESULT[1]}    barman2