ossim-igen: command not found

Have You tried accessing the binary with the full path?

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/ossim-igen - from package: ossim-core

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