ltpcli: 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/ltpcli - from package: ion

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

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