hsqldb-databasemanager: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/hsqldb-databasemanager - from package: hsqldb-utils

You may install the required package with command apt-get install {package}

Error in other languages:
hsqldb-databasemanager: bevel nie gevind nie
hsqldb-databasemanager: comandă negăsită
hsqldb-databasemanager: comando não encontrado
hsqldb-databasemanager: commande introuvable
hsqldb-databasemanager: command not found
hsqldb-databasemanager: käsku ei ole
hsqldb-databasemanager: không tìm thấy lệnh
hsqldb-databasemanager: komanda nerasta
hsqldb-databasemanager: Kommando nicht gefunden.
hsqldb-databasemanager: kommandot finns inte
hsqldb-databasemanager: komut yok
hsqldb-databasemanager: nie znaleziono polecenia
hsqldb-databasemanager: níor aimsíodh an t-ordú
hsqldb-databasemanager: no se encontró la orden
hsqldb-databasemanager: no s'ha trobat l'ordre
hsqldb-databasemanager: opdracht niet gevonden
hsqldb-databasemanager: parancs nem található
hsqldb-databasemanager: perintah tidak ditemukan
hsqldb-databasemanager: príkaz nenájdený
hsqldb-databasemanager: příkaz nenalezen
hsqldb-databasemanager: команда не найдена
hsqldb-databasemanager: командата не е открита
hsqldb-databasemanager: 命令找不到
hsqldb-databasemanager: コマンドが見つかりません