apbs-value: 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-value - from package: apbs-tools

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

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