lsusb: 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/lsusb - from package: usbutils
/usr/sbin/lsusb - from package: usbutils

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

On Debian possible default full paths are:

/usr/bin/lsusb - from package: usbutils

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

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