scp: 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/scp - from package: openssh-clients

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

On Debian possible default full paths are:

/usr/bin/scp - from package: openssh-client

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

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