psed: 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/psed - from package: perl

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

On Debian possible default full paths are:

/usr/bin/psed - from package: perl

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

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