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Tag: linux
flowgraph fails with “LLLL…” for one network adapter, succeeds with other adapter
I want to execute the usrp_echotimer_dual_cw example from the GNURadio gr-radar OOT module. The flowgraph works fine with the internal gigabit ethernet adapter but fails with the external PCI gigabit ethernet adapter. Here is the output of the successful execution (eth0) of the flowgraph: The failed execution…
R: cannot install ‘rasclass’ package on Ubuntu 14.04
I am trying to install ‘rasclass’ package on R (version 3.2.3) but somehow the installation always fails. The output is too large to be pasted here, but I found something interested in this question, that might be the key to solve this issue. Shortly: from the terminal I can see I have gcc-4.8 and…
How does/frequent unix tee command write stdout terminal output to file? if the output is too big
I am redirecting some tool stdout to tee command so that current progress can be seen on terminal as well as in the log file Here is the code snippet where I am running tool and its stdout is fed to tee command and this code snippet is written from tcl script. I can see current real time progress on
Urwid: make cursor invisible
I’m using urwid, which is a Python “framework” for designing terminal user interfaces in ncurses. There’s one thing though that I’m not able to do in urwid that was easy in curses – make the cursor invisible. As it is now, the cursor is visible when selecting buttons, and i…
Redirected output from a subprocess call getting lost?
I have some Python code that goes roughly like this, using some libraries that you may or may not have: Basically, I’m starting a subprocess that’s supposed to go download some data for me and print it to standard out. I’m redirecting that data to a file, and then, as soon as the subprocess …
What is the best way to evaluate two variables representing a single pipeline command in bash?
I have a function produce which determines whether a file is present and if not it runs the following command. This works fine when the command output simply writes to stdout. However in the command below I pipe the output to a second command and then to a third command before it outputs to stdout. In this sc…
How to end a process in another linux terminal
Background Info: I’m trying to set up a remote display using a raspberry pi. Currently I’m using fbi (frame buffer image viewer) to display the image. The device is going to be controlled via ssh or web interface – not sure which, but definitely not from the actual device. The Problem is I c…
bash scripting: combine var=$(…) and var=${var%%…} lines?
Is it possible and, if yes, how to convert the following expression to one-liner? Simple DEV=${(lsblk -no KNAME,MODEL | grep ‘ModelNAME’)%%’ModelNAME’} doesn’t work Answer zsh allows you to combine parameter expansions. Bash does not. For either bash or POSIX sh (both of which su…
mmap does not work as expected (return random 0xdeadbeef)
I am writing c++ on linux7arm and the physical address is referring to a memory block (that can be accessed/changed by other peripherals) when I map a page of physical address space to the local address space and try to read it, it works fine and show the expected data BUT not all the time. if I write a scrip…