illumina-dump.2: 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/illumina-dump.2 - from package: sra-toolkit

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

Error in other languages:
illumina-dump.2: bevel nie gevind nie
illumina-dump.2: comandă negăsită
illumina-dump.2: comando não encontrado
illumina-dump.2: commande introuvable
illumina-dump.2: command not found
illumina-dump.2: käsku ei ole
illumina-dump.2: không tìm thấy lệnh
illumina-dump.2: komanda nerasta
illumina-dump.2: Kommando nicht gefunden.
illumina-dump.2: kommandot finns inte
illumina-dump.2: komut yok
illumina-dump.2: nie znaleziono polecenia
illumina-dump.2: níor aimsíodh an t-ordú
illumina-dump.2: no se encontró la orden
illumina-dump.2: no s'ha trobat l'ordre
illumina-dump.2: opdracht niet gevonden
illumina-dump.2: parancs nem található
illumina-dump.2: perintah tidak ditemukan
illumina-dump.2: príkaz nenájdený
illumina-dump.2: příkaz nenalezen
illumina-dump.2: команда не найдена
illumina-dump.2: командата не е открита
illumina-dump.2: 命令找不到
illumina-dump.2: コマンドが見つかりません