asciiview: 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 Debian possible default full paths are:

/usr/bin/asciiview - from package: aview

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

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