omegat: 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/omegat - from package: omegat

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

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