list-keys.sh: 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/share/dotlrn/packages/acs-lang/bin/list-keys.sh - from package: dotlrn
/usr/share/openacs/packages/acs-lang/bin/list-keys.sh - from package: openacs

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

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