cvsgraph: 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/cvsgraph - from package: cvsgraph

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

On Debian possible default full paths are:

/usr/bin/cvsgraph - from package: cvsgraph

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

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