httxt2dbm: 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/sbin/httxt2dbm - from package: httpd

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

On Debian possible default full paths are:

/usr/sbin/httxt2dbm - from package: apache2-utils
/usr/lib/debug/usr/sbin/httxt2dbm - from package: apache2-dbg

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

Error in other languages:
httxt2dbm: bevel nie gevind nie
httxt2dbm: comandă negăsită
httxt2dbm: comando não encontrado
httxt2dbm: commande introuvable
httxt2dbm: command not found
httxt2dbm: käsku ei ole
httxt2dbm: không tìm thấy lệnh
httxt2dbm: komanda nerasta
httxt2dbm: Kommando nicht gefunden.
httxt2dbm: kommandot finns inte
httxt2dbm: komut yok
httxt2dbm: nie znaleziono polecenia
httxt2dbm: níor aimsíodh an t-ordú
httxt2dbm: no se encontró la orden
httxt2dbm: no s'ha trobat l'ordre
httxt2dbm: opdracht niet gevonden
httxt2dbm: parancs nem található
httxt2dbm: perintah tidak ditemukan
httxt2dbm: príkaz nenájdený
httxt2dbm: příkaz nenalezen
httxt2dbm: команда не найдена
httxt2dbm: командата не е открита
httxt2dbm: 命令找不到
httxt2dbm: コマンドが見つかりません