gigextract: 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/gigextract - from package: gigtools

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

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