tiffsplit: 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/tiffsplit - from package: libtiff

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

On Debian possible default full paths are:

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

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

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