ypbind: 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/sbin/ypbind - from package: ypbind

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

On Debian possible default full paths are:

/usr/sbin/ypbind - from package: nis

You may install the required package with command apt-get install {package}

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