Email terminal history to self / evernote at logout. Great for search for obscure syntax you figured out sometime on some machine

MailHistory.bash

#!/bin/bash

##################
# MailHistory.bash
# Ken Hansen 01/2010
#
# Calc history delta then email to self and evernote
#
# Called from ~/bash_logout
#
# Saves history in ~.history.old for comparison next time around
#
##################

# Email addresses to send transcript to
EMAIL_ADDRS="[email protected] [email protected]"

# remove all aliases (to make sure any alias of rm is removed)
unalias -a

# Clean up any old files
if [ -f ~/.history.new ]
then
    rm -f ~/.history.new
fi
if [ -f ~/.history.diff ]
then
    rm -f ~/.history.diff
fi

# make sure there is a history.old to diff
if [ ! -f ~/.history.old ]
then
    touch ~/.history.old
fi

# Save history to history.new
/usr/bin/grep -v \# ~/.bash_history > ~/.history.new

# diff new and old
diff ~/.history.new ~/.history.old | grep '<' | sed -e "s/< //g" > ~/.history.diff

# move new to old for next time
rm -f ~/.history.old
mv ~/.history.new ~/.history.old

####
# Caluclate email subject
# Get host hame
host=`/bin/hostname | /usr/bin/sed 's/\..*//'`
# Calculate date (e.g., Thu 02/25/10 10:30:42 PM0
dtstring=`/bin/date '+%a %m/%d/%y %I:%M:%S %p'`
subject="@TermHistory Diff $host $dtstring #History"

# mail history to evernote
/usr/bin/mailx -s "$subject" $EMAIL_ADDRS < ~/.history.diff