syldbquery: 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/syldbquery - from package: sylph-searcher

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

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