Receive public keys for repositories for which public keys are not found by apt-get

receve-apt-keys.sh

* For details: https://www.opennet.ru/base/sec/gpg_crypt.txt.html
* Also: http://f3arnil.blogspot.ru/2011/06/linux-apt-key.html

#!/bin/sh

KEY_SERVER=p80.pool.sks-keyservers.net

if [ -z $1 ]
then
    KEYS='sudo apt-get -qq update 2>&1 | awk '/NO_PUBKEY/ {print($NF)}' | uniq | tr '\n' '\ ''
    if [ -z $KEYS ]
        then
        echo "No missed public keys found."
    else
        echo "Missed public keys: $KEYS"
        for KEY in $KEYS
        do
            sudo apt-key adv --recv-keys --keyserver $KEY_SERVER $KEY &&\
            echo "Public key $KEY has been added."
        done
    fi
else
    KEYS='echo $@ | tr '\ ' '\n' | grep '\([[:alnum:]_]\|[a-fA-F]\)\{8,\}' | uniq | tr '\n' '\ ''
    echo "Public keys to add: $KEYS"
    for KEY in $KEYS
    do
        sudo apt-key adv --recv-keys --keyserver $KEY_SERVER $KEY > /dev/null &&\
        echo "Public key $KEY has been added."
    done
fi