testepsg: 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/testepsg - from package: gdal

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

On Debian possible default full paths are:

/usr/bin/testepsg - from package: gdal-bin

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

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