Does setting the net.core.rmem_default effect each socket or all sockets opened in the system? What is the maximum value I can configure for the net.core.rmem_default parameter? I understand it depends on RAM. Assume I have much RAM available. Answer net.core.rmem_default is the size of the incoming kernel so…
Does shell map restrict the key format?
Run the above code will get error: If I modify key=’dev’, it works. So, the key only can be a simple string? Answer You must declare the array associative first:
How to examine and debug Yocto’s bootloader on i.MX6Q?
I am building a trusted execution environment on IMX6Q with a Linux Yocto version in the untrusted processor mode. When I switch to non-secure for the first time after reset to load the linux kernel, I get flooded with data and prefetch abort exceptions after I jump to the kernels bootloader.It also seems lik…
Join two csv files
csvfile1 csvfile2 expected output I would like to combine the columns longitude,latitude and timestamp of both the files. There are two longitudes and two latitudes in csvfile2. So i want to compare if it matches any one of the longitude-latitude pairs along with the timestamp. And the column name order is al…
Unable to access apache page on Linux Azure VM
I’ve setup a linux VM in Azure. I’ve added incoming port access to the current listening port on Apache. I’ve also done a curl localhost on the VM and see the apache html text. I hit the public IP of the VM and get nothing. Any ideas? Answer According to your description, please check those …
Apache not seeing website – CentOS 7
I have setup a lot of Virtual Hosts in Ubuntu but today I needed to do this on a CentOS 7 server. I installed Apache and setup the VHost config but nothing appears when I view the site. I know that Apache is reading my Config files because if I add a fault in it and restart Apache, it complains
Exclude list of file extensions from find in bash shell
I want to write a cleanup routine for my make file that removes every thing except the necessary source files in my folder. For example, my folder contains files with the following extensions: .f .f90 .F90 .F03 .o .h .out .dat .txt .hdf .gif. I know I can accomplish this with: Using negation, I can do this: B…
Shell: how to create a list variable from several args
I have shell script that runs a cli command with 3 or more args, i can’t specify in advance the number of args that will be passed to the script. i tried to replace Args=[$3,$4,….] by Args=[${@:3}] but the arguments are not comma-separated. Answer Change the value of IFS inside the command substit…
Dynamically pick the user GUI and UID who’s running Docker at the host from entrypoint
I have the following script as the ENTRYPOINT of my Dockerfile and therefore Docker image: Everything is running fine for Linux since the GUI and UID for most of the distros is 1000 (we’re using Fedora and Ubuntu). Windows – I think – doesn’t care about it, but again the script works p…
How to take input in beginning of the program?
I am making a program which needs the user input in the beginning of the program if you don’t get my question i will give you an example: So, I want the input in the beginning of the program. I think the input will be stored in a variable. If yes, Then please tell me in which variable it is