Placed in my ~/.ssh directory and run when a new .pub file is added. Creates an authorized_keys file with the contents of every .pub file in the directory

buildkeys.sh

#!/bin/bash

KEYFILES=~/.ssh/*.pub #All public key files in git/.ssh
AUTHFILE=~/.ssh/authorized_keys #File to store authorized keys

echo 'Building authorized keys file'

# Clear current authorized keys file
if [ -e $AUTHFILE ]; then

    # Avoid overwriting old bakup files
    if [ -e $AUTHFILE.bak ]; then  #If backup already exists
	BAKINC=1 #Counter for backup files
	while [ -e $AUTHFILE$BAKINC.bak ]; do
	  ((BAKINC++))
	done
	touch $AUTHFILE$BAKINC.bak
	cat $AUTHFILE >> $AUTHFILE$BAKINC.bak
	echo Backed up $AUTHFILE to $AUTHFILE$BAKINC.bak
    else #If backup file doesnt exist
	touch $AUTHFILE.bak
	cat $AUTHFILE >> $AUTHFILE.bak
	echo Backed up $AUTHFILE to $AUTHFILE.bak
    fi
    cat /dev/null > $AUTHFILE
else
    touch $AUTHFILE
    chmod 740 $AUTHFILE
fi
echo ""

# Add keys to authorized keys file
shopt -s nullglob
for f in $KEYFILES
do
    cat $f >> $AUTHFILE
    echo Added key: $f
done

echo Keys built successfully
exit 0