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#! /bin/bash
# Append last line of mail into ~/.ssh/authorized_keys
# Usage:
# 1. put this file into ~/.forward
# 2. send mail with header "Passphase: ", and value in ~/.config/passphase
# 3. try ssh
# Restore mail in variable
MAIL="$(cat)"
# Get user passphase
test -f ~/.config/passphase || exit 1
PASSPHASE="$(cat ~/.config/passphase)"
# Check passphase, or exit 0
grep -qE "^Passphase: ${PASSPHASE}" <<<"$MAIL" || exit 0
# Append comment and last line to ~/.ssh/authorized_keys
exec 1>>~/.ssh/authorized_keys
<<<"$MAIL" grep 'From:' | head -1 | sed 's/^/# /'
<<<"$MAIL" sed -En '/^.+/p' | tail -1
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