opj_jpip_test: 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/opj_jpip_test - from package: libopenjpip-dec-server

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

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