witray: 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/witray - from package: wmii

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

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