I thought I found the perfect answer with How do I find all files containing specific text on Linux?, so I tried it: None show, but I know there should have been a match. I also tried escaping the backslash to no avail. Also tried single quotes to no avail. How to find all files containing specific text which…
Simulating ENTER key and export another variable together in Linux bash
I should put ENTER key value as a shell input to avoid shell waiting for user input. I have learned that ‘echo’ implicitly has an ENTER value, so tried to run below command to accomplish my requirement. As I expected, I can see the OS prompt instead of seeing Shell wait the user input. However, I …
ARM linux userspace gpio operations using mmap /dev/mem approach (able to write to GPIO registers, but fail to read from them)
Kernel version 3.12.30-AM335x-PD15.1.1 by PHYTEC. If I use the /sys/class/gpio way, I can see that the button input pin (gpio103 of AM3359) value changes from 0 to 1. Following the this exercise http://elinux.org/EBC_Exercise_11b_gpio_via_mmap and executing the below command for reading gpio pins usig /dev/me…
How to abort scp on failure using a flag?
Assuming scp 1 2 3 4 myhost:. is there a way to specify in the scp command to abort when the first failure occurs? scp default behaviour is to continue to the next file and not to stop and of course that can be addressed programmatically however looking for more ‘elegant’ approach if such exists. …
access order of std::atomic bool variable
I’ve a function that accesses(reads and writes to) a std::atomic<bool> variable. I’m trying to understand the order of execution of instructions so as to decide whether atomic will suffice or will I’ve to use mutexes here. The function is given below – I’ve read this page o…
ld undefined reference, despite library found and symbols exported
Been fighting with this on and off for 48 hours now; I’m still getting undefined reference errors when attempting to link a dynamic library with its dependency – despite all exports existing, and the library being found successfully. Scenario: libmemory (C++) – exports functions with extern …
Generating Total Time in Milliseconds in SQL Developer
I need to replicate the linux command “date +%s%3N” in SQL Developer. I have tried the below code sample but it returns with a different value. I have also done extensive searching Google with no luck. The date +%s%3N command returns something like: 1475615656692870653 Whereas the above code sampl…
When is scons “Depends” useful when compiling c/cpp files?
Any c/cpp files can call functions defined in other module, only linking phase resolve them. These c/cpp files don’t depend on each other for compiling sequence. So my question is, is there any case that one c/cpp file should depend on another one, so that we need to specify in SConstruct like: Thanks! …
How to make vim high-light as python when editing scons files?
I’m using vim to edit SConstruct files of scons, I want to make vim high-light as python grammar automatically. How to do that? How to associate file name of ‘SConstruct’ with ‘Python’ in vimrc? Thanks Answer Add this to your vimrc:
How can I make a ksh script terminate itself if any issues?
I have written a few ksh scripts, about 6 scripts. These are written to handle huge data files, something like 207 MB big. while running the script, sometimes it gets stuck and does not end. Human interruption is required. In production environment, I want it to run automatically, and should be able to end au…