findtr: 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/lib64/qt-3.3/bin/findtr - from package: qt3-devel
/usr/lib/qt-3.3/bin/findtr - from package: qt3-devel

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

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