ftnchek: 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/ftnchek - from package: ftnchek

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

On Debian possible default full paths are:

/usr/bin/ftnchek - from package: ftnchek

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

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