hmmstat: 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/hmmstat - from package: hmmer

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