unixcmd: 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/unixcmd - from package: vde2

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

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