zopectl.in: 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/lib/zope2.13/lib/python/Zope2-2.13.22.egg/Zope2/utilities/skel/bin/zopectl.in - from package: zope2.13

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

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