hello_other: 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/hello_other - from package: pvm-examples

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

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