kctreetest: 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/kctreetest - from package: kyotocabinet

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

On Debian possible default full paths are:

/usr/bin/kctreetest - from package: kyotocabinet-utils

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

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