failing_earl_tests.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/librdf-query-perl/examples/bin/failing_earl_tests.sh - from package: librdf-query-perl

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

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