tkdeskclient: 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/tkdeskclient - from package: tkdesk

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

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