pscp: 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/pscp - from package: putty

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

On Debian possible default full paths are:

/usr/bin/pscp - from package: putty-tools

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

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