Operating systems like Linux work on the principle of Copy-on-write, so even if you are allocating an array of say 100 GB, but only use upto 10GB, you would only be using 10 GB of memory. So, what would be the disadvantage of creating such a big array? I can see an advantage though, which is that you won̵…
Raspberry pi is in a reboot-loop
I wrote this python program for my Raspberry Pi 3: I made an edit in the /etc/rc.local that the program will autostart. The edit is only adding the following line before exit 0: python /home/pi/reboot.py But now my Raspberry pi 3 is in a reboot loop. How can I delete the line I added in /etc/rc.local? Answer …
Match unknown substring with RegEx
How can I get an unknown substring with an regular expression? I know what’s before and after the wanted string but I don’t want the known part with in the result. Example text: I’m looking for ‘SOMETHINGHERE’ and ‘SOMETHINGELSE’ only. vocher_ and .db are always befor…
Linux: Loop using foldername when finding file
I’m currently trying to use the following linux script to loop through folders and perform calculations using a function: The problem: How can I use the foldername to find the correct file? For example, the foldername is scan1 and I want to use the file called gaf_scan1_recording_mic.nii for the functio…
Install java 8 and 7 RE in linux Ubuntu
I already have installed in my linux Ubuntu the java 8 (Update 121), but I need to install the java 7 RE for a specific software that I need to use. I want the java 7 only to use with this tool, and I do not want to make any modification on my default java 8. How to do that?
Linux bash script symlink with spaces
I am trying to make a script which will find all the folders and files within a given hard drive. then i want to make the symlinks to another folder. However the ln command fails if the folder or file contains space, can someone help me to modify the ln -sf $MOVIE_FILE_LINKS -t $MOVIES_LIB command to make the…
Cannot Make Code Segment Execute-Only (Not Readable)
I’m trying to make the Code Segment Execute-Only (Not Readable). But I FAILED after I tried everything the Manual told me to. Here is what I did to make the code segment unreadable. First, I’ve found this in “Intel(R)64 and IA-32 Architectures Software Developer’s Manual(Combined Volum…
Uploaded file fails to save with no exception thrown in Java – Jersey
I’m trying to upload a file to a restful – Jersey web service deployed on Tomcat server that is a receives uploaded files as multipart . It works fully correct on Windows OS but on Linux the file fails to save with no exception thrown from the following saving method : The multipart variable is al…
Why can’t I send all messages with my server-client model?
I have implemented a simple server-client model to send and print messages between my Raspberry Pi and my laptop on which I run Linux, Ubuntu. Here are the client and then the server code. And the server code: I run the server code on my Raspberry Pi and the client code on my laptop. Connection happens succes…
How to check for occurrences of indexes in a file onto another by column and print out the result [closed]
Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago. Improve this question So i have a file1.dat with indexes i need to check (one by line) and a fil…