iofits: 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/iofits - from package: qfits-tools

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

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