imview: 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/imview - from package: imview

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

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