turtle_benchmark.pl: 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-trine-perl/examples/bin/turtle_benchmark.pl - from package: librdf-trine-perl

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

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