collink: 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/collink - from package: argyll

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

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