Keep the last old sql dump.

Author: jum

postgres/dumpdb.sh

@@ -1 +1,7 @@
-docker exec postgres sh -c 'exec pg_dumpall -U postgres -c ' >dbdump.psqldump
+#!/bin/sh
+SQLDUMP=dbdump.psqldump
+if test -f $SQLDUMP
+then
+	mv $SQLDUMP ${SQLDUMP}.old
+fi
+docker exec postgres sh -c 'exec pg_dumpall -U postgres -c ' >$SQLDUMP