test-sra: command not found

Have You tried accessing the binary with the full path?

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/test-sra - from package: sra-toolkit

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