sync_history.sh

echo copying local history file
history -a
cp .bash_history full_history

HOSTS="machine1.example.com machine2.example.com"
for i in $HOSTS; do
  echo copying history file from $i
  scp $i:~/.bash_history tmp_history.txt
  cat tmp_history.txt >>full_history
  wc -l tmp_history.txt
  wc -l full_history
done


echo sorting the new history file and removing duplicates
sort full_history|uniq >uniq_history
rm full_history

echo replacing history file with the new one
mv uniq_history .bash_history
echo reloading bash history from file
history -c
history -r


wc -l .bash_history


for i in $HOSTS; do
  echo backing up .bash_history in $i
  DATE=`date '+%Y%m%d%H%M%S'`
  ssh $i "cp ~/.bash_history ~/.bash_history$DATE"
  echo replacing .bash_history in $i
  scp .bash_history $i:~/.bash_history
done