kcprototest: 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/kcprototest - from package: kyotocabinet

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

On Debian possible default full paths are:

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

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

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