pegasus-plots: 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/pegasus-plots - from package: pegasus-wms

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

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