tiffcmp: 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/tiffcmp - from package: libtiff

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

On Debian possible default full paths are:

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

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

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