yyextract: 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/yyextract - from package: cutils

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

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