gindxbib: 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/gindxbib - from package: groff

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

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