tmxclean: command not found

Have You tried accessing the binary with the full path?

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/tmxclean - from package: libxml-tmx-perl

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