Amit's questions

We have a linux server in our lab which is shared among a number of developers. Server credentials (NOT root) are known to all and they log in using SSH. Now, when I logged in today I just realized that someone has deleted the folder I working on. It was there till yesterday EOD but has gone now. How can I know who deleted my folder ?

**EDIT :- ** I have just discovered the last command with some greps it gives a list of IPs from where a user logged in, that is great information, however it doesn't solve my purpose completely. I just want to know who deleted my folder. I just want to know if someone is willingly doing it since it has happened before also and restoring everything every time is just frustrating.

I require to test my UDP program using echo server. I have tested this application in LAN but now I require it to test it in Internet.

Is there and globally recognize freely available well known ECHO server that I can use directly in my application ?

Please help, thanks....

EDIT I already have a java based Echo Server program which I run on my desktop and connect the mobile using Wifi. Now I want tho check the app for Internet so I need the IP an port of some live server much like the DayTime service, provided by some IPs.