apbs-born: 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/apbs-born - from package: apbs-tools

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

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