pamtoxvmini: command not found

Have You tried accessing the binary with the full path?

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH

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/pamtoxvmini - from package: netpbm-progs

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