scantv: 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/scantv - from package: xawtv

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

On Debian possible default full paths are:

/usr/bin/scantv - from package: scantv

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

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