gdalident.py: 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/gdalident.py - from package: gdal-python

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

On Debian possible default full paths are:

/usr/bin/gdalident.py - from package: python-gdal

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

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