simhash: 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/simhash - from package: simhash

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

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