To dump a database called mydb into an SQL-script file:

$ pg_dump mydb > db.sql
To reload such a script into a (freshly created) database named newdb:

$ psql -d newdb -f db.sql
To dump a database into a custom-format archive file:

$ pg_dump -Fc mydb > db.dump
To dump a database into a directory-format archive:

$ pg_dump -Fd mydb -f dumpdir
To dump a database into a directory-format archive in parallel with 5 worker jobs:

$ pg_dump -Fd mydb -j 5 -f dumpdir
To reload an archive file into a (freshly created) database named newdb:

$ pg_restore -d newdb db.dump
To reload an archive file into the same database it was dumped from, discarding the current contents of that database:

$ pg_restore -d postgres --clean --create db.dump
To dump a single table named mytab:

$ pg_dump -t mytab mydb > db.sql
To dump all tables whose names start with emp in the detroit schema, except for the table named employee_log:

$ pg_dump -t 'detroit.emp*' -T detroit.employee_log mydb > db.sql
To dump all schemas whose names start with east or west and end in gsm, excluding any schemas whose names contain the word test:

$ pg_dump -n 'east*gsm' -n 'west*gsm' -N '*test*' mydb > db.sql
The same, using regular expression notation to consolidate the switches:

$ pg_dump -n '(east|west)*gsm' -N '*test*' mydb > db.sql
To dump all database objects except for tables whose names begin with ts_:

$ pg_dump -T 'ts_*' mydb > db.sql
To specify an upper-case or mixed-case name in -t and related switches, you need to double-quote the name; else it will be folded to lower case (see Patterns below). But double quotes are special to the shell, so in turn they must be quoted. Thus, to dump a single table with a mixed-case name, you need something like

$ pg_dump -t "\"MixedCaseName\"" mydb > mytab.sql


https://www.postgresql.org/docs/current/app-pgdump.html#PG-DUMP-EXAMPLES