tmx2html: 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/tmx2html - from package: libxml-tmx-perl

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

Error in other languages:
tmx2html: bevel nie gevind nie
tmx2html: comandă negăsită
tmx2html: comando não encontrado
tmx2html: commande introuvable
tmx2html: command not found
tmx2html: käsku ei ole
tmx2html: không tìm thấy lệnh
tmx2html: komanda nerasta
tmx2html: Kommando nicht gefunden.
tmx2html: kommandot finns inte
tmx2html: komut yok
tmx2html: nie znaleziono polecenia
tmx2html: níor aimsíodh an t-ordú
tmx2html: no se encontró la orden
tmx2html: no s'ha trobat l'ordre
tmx2html: opdracht niet gevonden
tmx2html: parancs nem található
tmx2html: perintah tidak ditemukan
tmx2html: príkaz nenájdený
tmx2html: příkaz nenalezen
tmx2html: команда не найдена
tmx2html: командата не е открита
tmx2html: 命令找不到
tmx2html: コマンドが見つかりません