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

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

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