I have one big problem. I had two files - main.c and logic.c. I have used sed for some modification in logic.c and then i saved it to main_updated.c and then run
mv main_updated.c main.c
BUT it had to be logic_updated.c and logic.c. PLS can anyone hlp me, how restore main.c file or i am dead.
Chances are very likely that your old data is gone. It really depends on how the filesystem works when it comes to overwriting data - if the filesystem simply releases the inodes and allocates new ones elsewhere on the drive, you may be able to use a recovery program to find the data... maybe - you'd have to know where to look since it would probably return a bunch of inodes (and it may not know which ones contained all the data for your files, so you'd have to piece it together manually).
Lesson learned - commit after (most) every change ;P
I am afraid that you have in fact clobbered your main.c file.
In the future you can use mv "interactively" with:
mv -i filename new_filename/or_path
It will check with you before overwriting a file.
Also frequent commits with your version control software is a good idea.
