zart: 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/zart - from package: gmic-zart

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

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