cacaview: 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/cacaview - from package: caca-utils

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

On Debian possible default full paths are:

/usr/bin/cacaview - from package: caca-utils

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

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