exif: 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/exif - from package: exif

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

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