sendip: 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/sendip - from package: sendip

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

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