ncflint: 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/ncflint - from package: nco

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

On Debian possible default full paths are:

/usr/bin/ncflint - from package: nco

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

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