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Login to Amazon EC2 via ssh
I have a question and am stuck at something. I recently created AWS EC2 Ubuntu instance with default settings. I have an Ubuntu machine locally as well and so far I managed to connect successfully to the Ubuntu instace with this command However I want to know if there is a simpler way to login to ssh without …
Function of shared library is loaded at different physical addresses for different processes
I get physical addresses of function “printf” in libc.so in two programs, and two physical addresses are different. And I read two different physical address, the content are almost the same. This means function “printf” has two copies in memory? Details: My os is 32-bit linux. Physica…
add another timer on already running loop
Given the following program – The second timer handle is never run on the loop, since the loop is already running, and “Timer2 called” is never printed. So I tried stopping the loop temporarily after running it and then adding the second timer – But this again didn’t work, probab…
What mechanism does gdb use to know where to “finish” a function call?
In gdb, when debugging inside a function, we can use “finish” command to run to the end of a function. My question is: how does gdb know the ending position of a function, especially when there’s no debugging symbol to match source code “{}”? I guess gdb looks for either “l…
Reading a file kills NIC interrupts
I have a very strange problem with a board based on a MIPS processor and Linux 2.6. There are NIC interrupts for all incoming Ethernet packets. If I send 10.000 packets I could see that 10.000 NIC interrupts occurred. However, after I open and close a file (filled with zeros or regular) in the filesystem, the…
How to make fork changes reflect with the master when updated?
Suppose i forked a repo from Github now iam having 2 project sources one is the main master branch in owner repository and other is my master branch in my fork. Now i got a problem like this. Suppose in my project there is a file Readme with the code like this Topics to completed So i have forked my
Assembly NASM x86 – Simple Stack Project
I’m writing a subroutine to simply reprint decimal numbers as strings using the stack, but not getting the values I expected. When I run it through the debugger I see that I can’t get the value from esi into al. I suspect that I’m not allowed to use esi in the manner that I am, but I’m…
Filtering a Block
I have multiple blocks of the below pattern I want to extract a block with Particular ID and Particular Name. The output should display For example :- I wanted to do using grep, sed, awk Thanks. Answer This sed should work for you: But you’d better use an xml parser as xmllint or xmlstarlet to parse val…
How do I sort a list of files and concatenate the contents in bash?
This works: But when I try to sort the the filenames, remove the newline the list of filenames that are piped to cat look identical to the previous but sorted: However cat returns this error: Answer Your xargs statement is expecting null terminated entries. If your filenames or directories have spaces, then y…