tx: 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 CentOS possible default full paths are:

/usr/bin/tx - from package: transifex-client

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

On Debian possible default full paths are:

/usr/bin/tx - from package: transifex-client

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