photorec: 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/photorec - from package: testdisk

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

On Debian possible default full paths are:

/usr/bin/photorec - from package: testdisk

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

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