osgtessellationshaders: 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/osgtessellationshaders - from package: openscenegraph

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

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