shutter: 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/shutter - from package: shutter

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

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