ntfscmp: 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:

/bin/ntfscmp - from package: ntfsprogs
/usr/bin/ntfscmp - from package: ntfsprogs

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

On Debian possible default full paths are:

/bin/ntfscmp - from package: ntfs-3g

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

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