polymerge: 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/polymerge - from package: geomview

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

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