pegasus-invoke: 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-invoke - from package: pegasus-wms

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

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