deepfind: 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/deepfind - from package: strigi

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

On Debian possible default full paths are:

/usr/bin/deepfind - from package: strigi-utils

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

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