alevtd: 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/alevtd - from package: xawtv

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

On Debian possible default full paths are:

/usr/bin/alevtd - from package: alevtd

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

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