in.identtestd: 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/sbin/in.identtestd - from package: libident-tools

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

On Debian possible default full paths are:

/usr/sbin/in.identtestd - from package: libident

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

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