icesh-lite: 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 Debian possible default full paths are:

/usr/bin/icesh-lite - from package: icewm-lite

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

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