srf_index_hash: 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 Debian possible default full paths are:

/usr/bin/srf_index_hash - from package: staden-io-lib-utils

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

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