spidey: 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/spidey - from package: ncbi-tools-bin

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

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