collate_alpha.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/collate_alpha.py - from package: qiime

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

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