primersearch: 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/primersearch - from package: emboss

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

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