cinnamon-extension-tool: 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/cinnamon-extension-tool - from package: cinnamon

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

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