repoquery: 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/repoquery - from package: yum-utils

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

On Debian possible default full paths are:

/usr/bin/repoquery - from package: yum-utils

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

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