icewmhint-experimental: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/icewmhint-experimental - from package: icewm-experimental

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