kobo-admin: 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/kobo-admin - from package: kobo-admin

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

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