cman_tool: 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/sbin/cman_tool - from package: cman

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

On Debian possible default full paths are:

/usr/sbin/cman_tool - from package: cman

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

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