telescope: 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 CentOS possible default full paths are:

/usr/bin/telescope - from package: nightview-cli

You may install the required package with command yum install {package}

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