trietool-0.2: 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/trietool-0.2 - from package: libdatrie1-bin

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

Error in other languages:
trietool-0.2: bevel nie gevind nie
trietool-0.2: comandă negăsită
trietool-0.2: comando não encontrado
trietool-0.2: commande introuvable
trietool-0.2: command not found
trietool-0.2: käsku ei ole
trietool-0.2: không tìm thấy lệnh
trietool-0.2: komanda nerasta
trietool-0.2: Kommando nicht gefunden.
trietool-0.2: kommandot finns inte
trietool-0.2: komut yok
trietool-0.2: nie znaleziono polecenia
trietool-0.2: níor aimsíodh an t-ordú
trietool-0.2: no se encontró la orden
trietool-0.2: no s'ha trobat l'ordre
trietool-0.2: opdracht niet gevonden
trietool-0.2: parancs nem található
trietool-0.2: perintah tidak ditemukan
trietool-0.2: príkaz nenájdený
trietool-0.2: příkaz nenalezen
trietool-0.2: команда не найдена
trietool-0.2: командата не е открита
trietool-0.2: 命令找不到
trietool-0.2: コマンドが見つかりません