function_grep.pl: 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/function_grep.pl - from package: wine-devel

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

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