xawtv: 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/xawtv - from package: xawtv

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

On Debian possible default full paths are:

/usr/bin/xawtv - from package: xawtv

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

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