==== Use TOTP on *nix command line ====

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It is surely really handy to be able to **generate TOTP codes** on the command line,
as it can be used either as a **secure client**, or by integrating it on a **custom service**.

Instructions for **Debian-based** Linux's, (adapt it to your needs)
<code bash>
apt-get install oathtool

# save the secrets somewhere
echo 'SECRET_FOR_AMAZON' > ~/.otp/amazon
echo 'SECRET_FOR_PROTONMAIL' > ~/.otp/proton

# create the current time code by file output
cat ~/.otp/amazon | xargs oathtool --totp --base32
cat ~/.otp/proton | xargs oathtool --totp --base32

# (optionally), you can copy directly to clipboard without cat'ing it
# by using the xclip tool (apt-get install xclip)
cat ~/.otp/proton | xargs oathtool --totp --base32 | xclip -rmlastnl -i /dev/stdin

</code>

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**Have a QR code on the screen** and don't know **how to copy** the secret value **manually**??
unless the **service gives you the ability** to copy the secret directly, you **won't be able** to do so.

Follow the **other guide** i made about [[docu:csheet:dtproc:images:qr_code_parsing|QR code image handling]] so you can **save the secret for creating codes** on the command line later.