poclean: 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/poclean - from package: translate-toolkit

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

On Debian possible default full paths are:

/usr/bin/poclean - from package: translate-toolkit

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

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