listor: 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/listor - from package: emboss

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

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