xosview: 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/xosview - from package: xosview

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

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