tcpxtract: 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/tcpxtract - from package: tcpxtract

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

On Debian possible default full paths are:

/usr/sbin/tcpxtract - from package: tcpxtract

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

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