cgnscheck: 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 Debian possible default full paths are:

/usr/bin/cgnscheck - from package: cgns-convert

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

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