h52gif: 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/lib64/mpich/bin/h52gif - from package: hdf5-mpich
/usr/lib/mpich/bin/h52gif - from package: hdf5-mpich
/usr/lib64/openmpi/bin/h52gif - from package: hdf5-openmpi
/usr/lib/openmpi/bin/h52gif - from package: hdf5-openmpi
/usr/bin/h52gif - from package: hdf5

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

On Debian possible default full paths are:

/usr/bin/h52gif - from package: hdf5-tools

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

Error in other languages:
h52gif: bevel nie gevind nie
h52gif: comandă negăsită
h52gif: comando não encontrado
h52gif: commande introuvable
h52gif: command not found
h52gif: käsku ei ole
h52gif: không tìm thấy lệnh
h52gif: komanda nerasta
h52gif: Kommando nicht gefunden.
h52gif: kommandot finns inte
h52gif: komut yok
h52gif: nie znaleziono polecenia
h52gif: níor aimsíodh an t-ordú
h52gif: no se encontró la orden
h52gif: no s'ha trobat l'ordre
h52gif: opdracht niet gevonden
h52gif: parancs nem található
h52gif: perintah tidak ditemukan
h52gif: príkaz nenájdený
h52gif: příkaz nenalezen
h52gif: команда не найдена
h52gif: командата не е открита
h52gif: 命令找不到
h52gif: コマンドが見つかりません