jam.perforce: 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 Debian possible default full paths are:

/usr/bin/jam.perforce - from package: jam

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

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