icewmhint: 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/icewmhint - from package: icewm

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

On Debian possible default full paths are:

/usr/bin/icewmhint - from package: icewm

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

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