impose: 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/impose - from package: impose+

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

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