gtscompare: 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/gtscompare - from package: libgts-bin

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

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