cgnsversion: 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/cgnsversion - from package: cgns-convert

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

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