tcfmgr: 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/tcfmgr - from package: tokyocabinet

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

On Debian possible default full paths are:

/usr/bin/tcfmgr - from package: tokyocabinet-bin

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

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