icehelp: 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/icehelp - from package: icewm

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

On Debian possible default full paths are:

/usr/bin/icehelp - from package: icewm

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

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