fastaq_trim_Ns_at_end: 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/bin/fastaq_trim_Ns_at_end - from package: fastaq

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

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