texifyruby: 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/texifyruby - from package: texify

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

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