tapecalc: 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/tapecalc - from package: tapecalc

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

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