oncechar: 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:

/var/lib/wims/public_html/bin/oncechar - from package: wims

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

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