po_cos_naming_shell: 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/lib/debug/usr/bin/po_cos_naming_shell - from package: libpolyorb-dbg
/usr/bin/po_cos_naming_shell - from package: polyorb-servers

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