kindleclip: 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/kindleclip - from package: kindleclip

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

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