Question: How do I executed PostgreSQL Commands inside a Linux / UNIX shell script?
Answer: With the help of the psql interactive terminal, you can execute the psql commands from the shell script. For this purpose, you should enable the password less login by pg_hba.conf, or .pgpass.
psql DBNAME USERNAME << EOF statement 1; statement 2; . . statement n; EOF
PostgreSQL: Executing SQL from shell scripts
Provide all the postgreSQL commands between the EOF block as shown below.
#!/bin/sh dbname="test" username="test" psql $dbname $username << EOF SELECT * FROM test; EOF
PostgreSQL: Using variables in SQL from shell scripts
You can also use shell script variable inside the EOF block as shown below.
#!/bin/sh dbname="test" username="test" wherecond="tgs" psql $dbname $username << EOF SELECT * FROM test WHERE col_name = '$wherecond'; EOF