scantailor-cli: 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/scantailor-cli - from package: scantailor

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

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