ncap2: command not found

Have You tried accessing the binary with the full path?

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/ncap2 - from package: nco

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

On Debian possible default full paths are:

/usr/bin/ncap2 - from package: nco

You may install the required package with command apt-get install {package}
Error in other languages:
ncap2: bevel nie gevind nie
ncap2: comandă negăsită
ncap2: comando não encontrado
ncap2: commande introuvable
ncap2: command not found
ncap2: käsku ei ole
ncap2: không tìm thấy lệnh
ncap2: komanda nerasta
ncap2: Kommando nicht gefunden.
ncap2: kommandot finns inte
ncap2: komut yok
ncap2: nie znaleziono polecenia
ncap2: níor aimsíodh an t-ordú
ncap2: no se encontró la orden
ncap2: no s'ha trobat l'ordre
ncap2: opdracht niet gevonden
ncap2: parancs nem található
ncap2: perintah tidak ditemukan
ncap2: príkaz nenájdený
ncap2: příkaz nenalezen
ncap2: команда не найдена
ncap2: командата не е открита
ncap2: 命令找不到
ncap2: コマンドが見つかりません