...

• The target database has the right schema, tables, etc, and is empty. See the create scripts in the scripts/ directory.
• Both the source and destination database are called filesender

Postgres to MySQL

Basically a shell script one liner: 

pg_dump -U username -h hostname -a --inserts filesender |
sed -r 's/^(INSERT\ INTO\ )(files|logs)(\ VALUES\ )/\1`\2`\3/g' |
grep --color=never "^INSERT INTO" |
mysql -u username -h hostname -p filesender

Postgres to SQLite

pg_dump -U username -h hostname -a --inserts filesender |
sed -r 's/^(INSERT\ INTO\ )(files|logs)(\ VALUES\ )/\1`\2`\3/g' |
grep --color=never "^INSERT INTO" |
sqlite3 filesender.sqlite