fixpix: 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/fixpix - from package: wcstools

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

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