I’m new to bash scripting, I’m learning how commands work, I stumble in this problem, I have a file /home/fedora/file.txt Inside of the file is like this: What I wanted is to retrieve words between “[” and “]”. What I tried so far is : I can print the words between “[…
How to get the returned stdout of a program called with QProcess?
I am writing a program in Qt and currently using popen to run a linux command and read the output into a string: So I’d like to throw the above code away as I’d prefer to use higher level facilities provided by Qt if possible. Does anyone have an example of how to do this with QProcess or atleast …
How do I get vagrant halt to successfully shut down debian jessie vm on yosemite host?
Whenever I attempt to run vagrant halt, it says “default: Attempting graceful shutdown of VM…” but eventually times out and says ” default: Forcing shutdown of VM…” sometimes this works and sometimes it leaves the VM in running state, according to the VirtualBox UI. Here ar…
How to extract something out of a file after greping?
How can I extract group-3-vm1 after I do this grep? Here’s the result: Answer This awk command replaces the grep and tail commands while also extracting the text of interest: How it works -F'[:/]’ This sets the field separator to either a colon or a slash. /Tracking URL/{n=$4;} This looks for line…
Segmentation fault with ucontext makecontext on OS X 10.10
I run my code in OS X 10.10 with gcc. I am trying to implement a usercontext library. If I comment out thread_create( &t2, thr2, NULL);, the code will produce desired effect. I have no idea why a line related to t2 will lead to segmentation fault of t1. Author’s Notes I happily work on implementing …
Detect if a remote computer is Windows or Linux OS
I have IP Address and Server name of a remote computer. I am able to query WMI to get the OS version if the computer is running Windows but is there a way i can query the remote computer and get the OS version if the computer is not running Windows (Linux, Solaris)? Answer I guess Active Directory is going
When using the GCC driver, what makes a static lib “incompatible”?
So what I am trying to do is on Ubuntu 14.04 (x86_64) I want to set up musl-libc based on the latest released 1.1.11 version which is available at this moment. What I did was to: Install multilib support for GCC: sudo apt-get –no-install-recommends install gcc-multilib Configure the libraries for 32-bit…
Grepping Numbers With Decimal Places
I’m trying to figure out how to grep a time stamp read from a file that consists of a number with a decimal, but I can’t seem to get the output I’m looking for, any help would be great! Thanks in advance. Example: The result should be: What I’ve Tried: Answer you can use awk to split t…
Detecting the linux distribution from java
Is there a (preferably efficient, i.e. without executing binaries and parsing their outputs) way of detecting the Linux distribution in Java? As far as I know, System provides os.name, os.arch and os.version, which don’t seem to help. For a typical Ubuntu installation they get these values: os.name: amd…
Any equivalent function to pthread_getcpuclockid since i have tid of Thread
To get perf statistics of parallel running threads – To get list of threads I use thread list in /proc/self/task Now I want to get ID of a thread’s CPU time clock. But clock_getcpuclockid only works with PIDs. pthread_getcpuclockid requires the pthread id of thread and I did not find any way to ge…