ptview: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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 Debian possible default full paths are:

/usr/bin/ptview - from package: aqsis

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