spatialite_tool: 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/spatialite_tool - from package: spatialite-bin

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

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