pamendian: 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/pamendian - from package: netpbm-progs

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

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