finger@: 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/finger@ - from package: ucspi-tcp-ipv6
/usr/bin/finger@ - from package: ucspi-tcp

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

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