ctow: 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 CentOS possible default full paths are:

/usr/bin/ctow - from package: Canna

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/ctow - from package: Canna

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

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