cameratopam: 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/cameratopam - from package: netpbm-progs

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

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