otfshrink: 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/otfshrink - from package: otf-trace

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

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