alevt-cap: 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/alevt-cap - from package: alevt

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

On Debian possible default full paths are:

/usr/bin/alevt-cap - from package: alevt
/usr/bin/alevt-cap - from package: dvb-apps

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

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