cgnslist: 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/cgnslist - from package: cgns-convert

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

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