h4cc: 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:

/usr/bin/h4cc - from package: hdf

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

On Debian possible default full paths are:

/usr/bin/h4cc - from package: hdf4-tools

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

Error in other languages:
h4cc: bevel nie gevind nie
h4cc: comandă negăsită
h4cc: comando não encontrado
h4cc: commande introuvable
h4cc: command not found
h4cc: käsku ei ole
h4cc: không tìm thấy lệnh
h4cc: komanda nerasta
h4cc: Kommando nicht gefunden.
h4cc: kommandot finns inte
h4cc: komut yok
h4cc: nie znaleziono polecenia
h4cc: níor aimsíodh an t-ordú
h4cc: no se encontró la orden
h4cc: no s'ha trobat l'ordre
h4cc: opdracht niet gevonden
h4cc: parancs nem található
h4cc: perintah tidak ditemukan
h4cc: príkaz nenájdený
h4cc: příkaz nenalezen
h4cc: команда не найдена
h4cc: командата не е открита
h4cc: 命令找不到
h4cc: コマンドが見つかりません