blastall_old: 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/blastall_old - from package: blast2

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

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