change MySQL commands to PostgreSQL in a bash script

I have a bash script to backup MySQL databases. I have pasted the relevant part below (ignore the variables). The 2 lines I think I need to change to make this work in PostgreSQL are; DBS="$(mysql --login-path=dbbkup -Bse 'show databases')" and $MYSQLDUMP --login-path=dbbkup --add-drop-database --single-transaction --triggers --routines --events --set-gtid-purged=OFF $db | $GZIP > $FILE Can anyone advise as to how I can get the same functionality with PostgreSQL? # get all database listing DBS="$(mysql --login-path=dbbkup -Bse 'show databases')" # start to dump database one by one for db in $DBS do DUMP="yes"; if [ "$IGNOREDB" != "" ]; then for i in $IGNOREDB # Store all value of $IGNOREDB ON i do if [ "$db" == "$i" ]; then # If result of $DBS(db) is equal to $IGNOREDB(i) then DUMP="NO"; # SET value of DUMP to "no" #echo "$i database is being ignored!"; fi done fi if [ "$DUMP" == "yes" ]; then # If value of DUMP is "yes" then backup database FILE="$BACKUPDIR/$NOW-$db.sql.gz"; echo "BACKING UP $db"; $MYSQLDUMP --login-path=dbbkup --add-drop-database --single-transaction --triggers --routines --events --set-gtid-purged=OFF $db | $GZIP > $FILE fi done