gdal_trace_outline: 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/gdal_trace_outline - from package: dans-gdal-scripts

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

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