I have the following problem. I’m using Debian GNU/Linux Stretch and I am trying to use netcat as a simple server. I start it using following command: It starts just fine and accepts connections but on a different port than requested: This behavior is independent of requested port, user or ufw status. R…
libusb for USB target user space driver
I would like to implement a USB device driver in user space by means of libusb. I’m using a Linux machine supporting a USB OTG controller which is switched to device mode. The USB host is another machine which needs to communicate with my Linux machine by means of a USB vendor specific interface with a …
using watch , tail and ccze together
I have used watch and tail together like this: Also I have used tail and ccze for colorizing log file as below: But I dont know how should I use all of these three together in a single command. Does any one have any idea? Answer Recent versions of watch has -c | –color option, so perhaps this will work
Bash: Sort text file by bytewise case sensitive sort command or using python sort command
Text File using sort -s (case sensitive) using sort -f (Not case sensitive) The words starting with an uppercase are sorted alphabetically between the lowercase words. What I want is that the words in uppercase are at the start of each next letter (upercase alphabetically sorted): Expected output: How can I r…
How to specify the include and lib path of pgm library when making PCA-SIFT code
I am trying to make the PCA-SIFT code (pcasift-0.91nd.tar.gz) in this webpage: http://www.cs.cmu.edu/~yke/pcasift/. After running ./configure which is OK, the make command report that the C compiler can not find header pgm.h: image.cc:18:22: fatal error: pgm.h: No such file or directory #include ^ compilation…
how to identify source of frequent process startup
Some months ago I used to play around with Python and Django, finally setting up a Django web service running python manage.py … on a RaspberryPi. Now, I’d like to use the Linux device for other things. Unfortunately, there seems to be a frequent startup of some process (every couple of seconds) t…
aapt missing but its there
I had to reinstall ubuntu-14.04-64 due to reasons. After this reinstall, when I try to build my android projets, I get a bunch of these lines (among others) in output: Now, I know this file exists in my setup because this: I have installed all sdk tools from v19 onwards. Changing project settings to any of th…
Match two lines, replace with three lines
I need to use sed to replace every matching two-line pattern with a three line pattern. Here’s my input file (tempfile.txt). Basically, if a client-hostname “HOSTNAME”; is missing, then it should be replaced with a tab and then a newline. My attempt: sed ‘N; /hardware.*}/d; P; D’…
What is the difference between read+write and read+write+truncate?
This is an easy question, but I couldn’t find an explanation anywhere I’m using fopen in C++, and I have the option to either use “r+b” (Read and Write) Or w+b” (Read Write and Truncate) What is the meaning of Truncate? What is the difference between “r+b” and “…
Delete a single line from a file with a unix shell script
I’m working with a simple shell script that needs to delete a single line from a file if a string entered at command line is found. Instead it deletes the entire contents of the file. the data file is like this(each entry is on a new line): my code: Answer N means the line number , begin from 1