tiffdump: 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/tiffdump - from package: libtiff

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

On Debian possible default full paths are:

/usr/bin/tiffdump - from package: libtiff-tools

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

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