infotopam: 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
/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/infotopam - from package: netpbm-progs

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