run_all_tests_unix.sh: 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/share/doc/libterralib-doc/examples/image_processing/bin/run_all_tests_unix.sh - from package: libterralib-doc

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

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