cannacheck: 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/cannacheck - from package: Canna

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

On Debian possible default full paths are:

/usr/bin/cannacheck - from package: canna-utils

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

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