exiftags: 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/exiftags - from package: exiftags

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

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