pdftexi2dvi: 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/pdftexi2dvi - from package: texinfo-tex

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

On Debian possible default full paths are:

/usr/bin/pdftexi2dvi - from package: texinfo

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

Error in other languages:
pdftexi2dvi: bevel nie gevind nie
pdftexi2dvi: comandă negăsită
pdftexi2dvi: comando não encontrado
pdftexi2dvi: commande introuvable
pdftexi2dvi: command not found
pdftexi2dvi: käsku ei ole
pdftexi2dvi: không tìm thấy lệnh
pdftexi2dvi: komanda nerasta
pdftexi2dvi: Kommando nicht gefunden.
pdftexi2dvi: kommandot finns inte
pdftexi2dvi: komut yok
pdftexi2dvi: nie znaleziono polecenia
pdftexi2dvi: níor aimsíodh an t-ordú
pdftexi2dvi: no se encontró la orden
pdftexi2dvi: no s'ha trobat l'ordre
pdftexi2dvi: opdracht niet gevonden
pdftexi2dvi: parancs nem található
pdftexi2dvi: perintah tidak ditemukan
pdftexi2dvi: príkaz nenájdený
pdftexi2dvi: příkaz nenalezen
pdftexi2dvi: команда не найдена
pdftexi2dvi: командата не е открита
pdftexi2dvi: 命令找不到
pdftexi2dvi: コマンドが見つかりません