single_rarefaction.py: 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/lib/qiime/bin/single_rarefaction.py - from package: qiime

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

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