view-mesh: 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/view-mesh - from package: slic3r

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

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