exiftran: 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 CentOS possible default full paths are:

/usr/bin/exiftran - from package: fbida

You may install the required package with command yum install {package}

On Debian possible default full paths are:

/usr/bin/exiftran - from package: exiftran

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

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