micalc: 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/micalc - from package: mitools

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

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