dvibook: 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/dvibook - from package: texlive-dviutils

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

On Debian possible default full paths are:

/usr/bin/dvibook - from package: texlive-binaries

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

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