hb-shape: 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/hb-shape - from package: libharfbuzz-bin

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

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