renum: command not found

Have You tried accessing the binary with the full path?

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/renum - from package: bwbasic

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