ZSH: Print time to execute each command as it is executed.

.zshrc

preexec () {
    START="$(python -c 'import time; print time.time()')"
    LAST_CMD=$1
}

precmd () {
    LAST=$?
    if [ -z ${START} ];
    then
    else
        echo -n "Executed [$LAST_CMD: $LAST] in "
        python -c "import time; print '%0.3fs.' % (time.time() - $START)"
    fi
    
    unset LAST
    unset LAST_CMD
    unset START
}

You don't need python for this..

True. But as long as you are execing any external command, its all the same. Would be interesting if it can be done using only shell builtins tho.