Nitwit, Blubber, Oddment, Tweak !!
A lot of time I open a file, make changes and when the time comes to save it realize that I hadn’t sudo’ed it. Learnt that the following command helps:
:w ! sudo tee %
Here’s the reason:
:w tells the vi to save modification of the file
! sudo tee executes the tee command with sudo permissions taking it’s input from :w
% here means the current file name
From the SDE Tip – Amazon
Popularity: 1% [?]
Having completed the coding of my BTP, I had to test the program. I wrote down a simple C program to do this and generate the outputs in log files in a specified folder. However, I messed it up big time. The actions included creating temporary files, catenating them and then moving them. I did it horribly wrong and ended up with lots of garbage in each log file. Only the last 50 lines of each file were the results, rest garbage.
I needed a way to retain the last 50 lines of each file and discard the rest. This is when I stumbled across the tail command. It does exactly this ! All you have to do call tail -50 <filename> for each of the files. Sweet !
A simple recursive loop, calling the tail command for each file, and yay I am done with my work. Now it is the time to analyse the results.
Popularity: 2% [?]