mimeview: 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/mimeview - from package: mailutils

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

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