iproxy: 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 CentOS possible default full paths are:

/usr/bin/iproxy - from package: usbmuxd

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/iproxy - from package: libusbmuxd-tools

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

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