iceauth: 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 CentOS possible default full paths are:

/usr/bin/iceauth - from package: xorg-x11-server-utils

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/iceauth - from package: x11-xserver-utils

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

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