texi2html: 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/texi2html - from package: texi2html

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

On Debian possible default full paths are:

/usr/bin/texi2html - from package: texi2html

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

Error in other languages:
texi2html: bevel nie gevind nie
texi2html: comandă negăsită
texi2html: comando não encontrado
texi2html: commande introuvable
texi2html: command not found
texi2html: käsku ei ole
texi2html: không tìm thấy lệnh
texi2html: komanda nerasta
texi2html: Kommando nicht gefunden.
texi2html: kommandot finns inte
texi2html: komut yok
texi2html: nie znaleziono polecenia
texi2html: níor aimsíodh an t-ordú
texi2html: no se encontró la orden
texi2html: no s'ha trobat l'ordre
texi2html: opdracht niet gevonden
texi2html: parancs nem található
texi2html: perintah tidak ditemukan
texi2html: príkaz nenájdený
texi2html: příkaz nenalezen
texi2html: команда не найдена
texi2html: командата не е открита
texi2html: 命令找不到
texi2html: コマンドが見つかりません