AtoB: 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/AtoB - from package: pki-java-tools

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