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#!/bin/bash
# myapp daemon
# chkconfig: 345 20 80
# description: myapp daemon
# processname: myapp

DAEMON_PATH="/home/wes/Development/projects/myapp"

DAEMON=myapp
DAEMONOPTS="-my opts"

NAME=myapp
DESC="My daemon description"
PIDFILE=/var/run/$NAME.pid
SCRIPTNAME=/etc/init.d/$NAME

case "$1" in
start)
	printf "%-50s" "Starting $NAME..."
	cd $DAEMON_PATH
	PID=`$DAEMON $DAEMONOPTS > /dev/null 2>&1 & echo $!`
	#echo "Saving PID" $PID " to " $PIDFILE
        if [ -z $PID ]; then
            printf "%s\n" "Fail"
        else
            echo $PID > $PIDFILE
            printf "%s\n" "Ok"
        fi
;;
status)
        printf "%-50s" "Checking $NAME..."
        if [ -f $PIDFILE ]; then
            PID=`cat $PIDFILE`
            if [ -z `ps axf | grep 5003 | grep -v grep` ]; then
                printf "%s\n" "Process dead but pidfile exists"
            else
                echo "Running"
            fi
        else
            printf "%s\n" "Service not running"
        fi
;;
stop)
        printf "%-50s" "Stopping $NAME"
            PID=`cat $PIDFILE`
            cd $DAEMON_PATH
        if [ -f $PIDFILE ]; then
            kill -HUP $PID
            printf "%s\n" "Ok"
            rm -rf $PIDFILE
        else
            printf "%s\n" "pidfile not found"
        fi
;;

restart)
  	$0 stop
  	$0 start
;;

*)
        echo "Usage: $0 {status|start|stop|restart}"
        exit 1
esac

This script will work in /etc/init.d on Xubuntu 11.10 (so most Debian-based systems) and CentOS 5.5 and you can control it via chkconfig.

1. That said, if you know of such an example I’d love to hear from you.

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PROTECT IP Act Breaks The Internet from Fight for the Future on Vimeo.

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Increasingly JSON is being used as a transport medium for data and with the rise of NoSQL solutions, having a selector language for JSON makes a lot of sense when dealing with JSON documents whose structure isn’t deterministic.

JSONSelect provides a good implementation of just such a JSON selector language but after working with it on a project I found myself needing to do more than it allowed me to do. Namely, I wanted 1. to be able to perform a selection and receive matching paths instead of the data contained in those paths and I wanted 2. to be able to modify data specified at a path location in-place.

jsonselect.match(sel, obj, asPath); // Added the asPath flag to return a path instead of the values
jsonselect.forEach(sel, obj, fun, asPath); // Added the same flag to forEach, I use this to
jsonselect.get(path,obj); // For getting the value using a path
jsonselect.set(path, value, obj); // For setting the value of a path
jsonselect.del(path,root); // For deleting a path

Here is my modified version of jsonselect in case anyone needs help solving the same problems I mentioned above.

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yesterday = datetime.datetime.now() - datetime.timedelta(days = 1)
yesterday_beginning = datetime.datetime(yesterday.year, yesterday.month, yesterday.day,0,0,0,0)
yesterday_beginning_time = int(time.mktime(yesterday_beginning.timetuple()))
yesterday_end = datetime.datetime(yesterday.year, yesterday.month, yesterday.day,23,59,59,999)
yesterday_end_time = int(time.mktime(yesterday_end.timetuple()))

print yesterday_beginning_time
print yesterday_end_time

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var currentOps = db.currentOp();

if(!currentOps.inprog || currentOps.inprog.length < 1) {
    print("No operations in progress");
} else {
    for(o in currentOps.inprog) {
        var op = currentOps.inprog[o];
        if(op.msg && op.msg.match(/bg index build/)) {
            print(op.opid+' - '+op.msg);
        }
    }
}

Here's the output:

$ mongo mycluster:30000/mydb bgIndexBuildStatus.js
MongoDB shell version: 1.8.1
connecting to: mycluster:30000/mydb
shard0000:343812263 - bg index build 122042652/165365928 73%
shard0001:355224633 - bg index build 111732254/165568168 67%

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function allNulls($arr) {
    if(is_array($arr) && count(array_diff($arr, array(null))) == 0) {
            return true;
    }

    return false;
}

echo (allNulls(array(null,null,null)) ? "true" : "false") . PHP_EOL;
echo (allNulls(array(null,1,null)) ? "true" : "false") . PHP_EOL;
echo (allNulls(array("test",null,null)) ? "true" : "false") . PHP_EOL;
echo (allNulls(array("",null,null)) ? "true" : "false") . PHP_EOL;
echo (allNulls(array(0,null,null)) ? "true" : "false") . PHP_EOL;

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