tokens: command not found

Have You tried accessing the binary with the full path?

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/tokens - from package: openafs-client

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