grib_parser: 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/grib_parser - from package: libgrib-api-tools

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

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