hmmsearch: 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/hmmsearch - from package: hmmer

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

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