icewm-menu-gnome2: 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/icewm-menu-gnome2 - from package: icewm-gnome

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

On Debian possible default full paths are:

/usr/bin/icewm-menu-gnome2 - from package: icewm-gnome-support

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

Error in other languages:
icewm-menu-gnome2: bevel nie gevind nie
icewm-menu-gnome2: comandă negăsită
icewm-menu-gnome2: comando não encontrado
icewm-menu-gnome2: commande introuvable
icewm-menu-gnome2: command not found
icewm-menu-gnome2: käsku ei ole
icewm-menu-gnome2: không tìm thấy lệnh
icewm-menu-gnome2: komanda nerasta
icewm-menu-gnome2: Kommando nicht gefunden.
icewm-menu-gnome2: kommandot finns inte
icewm-menu-gnome2: komut yok
icewm-menu-gnome2: nie znaleziono polecenia
icewm-menu-gnome2: níor aimsíodh an t-ordú
icewm-menu-gnome2: no se encontró la orden
icewm-menu-gnome2: no s'ha trobat l'ordre
icewm-menu-gnome2: opdracht niet gevonden
icewm-menu-gnome2: parancs nem található
icewm-menu-gnome2: perintah tidak ditemukan
icewm-menu-gnome2: príkaz nenájdený
icewm-menu-gnome2: příkaz nenalezen
icewm-menu-gnome2: команда не найдена
icewm-menu-gnome2: командата не е открита
icewm-menu-gnome2: 命令找不到
icewm-menu-gnome2: コマンドが見つかりません