I have a 1.txt file: A 2.txt file: FS for 1.txt is “||o||” and for 2.txt is “:” I want to merge two files in a single file result.txt based on the condition that the 3rd column of 1.txt must match with 1st column of 2.txt file and should be replaced by the 2nd column of 2.txt file. The…
Multiple parallel tcp connections
My (linux) server has two public IPs and I would like to make some parallel connections, to a same or different servers (my server acts as client program here; it just runs a C++ program that communicates with other servers to fetch some data). Let’s suppose I want to stablish 100 parallel connections, …
Inconsistent behavior when replacing substring with tilde “~” in a BASH parameter expansion
I came across some strangely inconsistent behavior in BASH parameter expansions across a few different servers, while trying to write a quick function. On some versions of BASH, to use a tilde in a substring replacement, the tilde must be escaped, or it will be re-expanded to the home directory: while on othe…
Bash Script Unstable Result
I have bash script and I put in the crontab. It runs every 10 minutes. When I run it manually, it gives perfect results. It creates “.tmp” files and these “.tmp” files are not empty, but Crontab results are not as I expected. it only creates “.tmp” files. Contents of “…
Can I run docker diff from a container on the same host as the container I want to run the diff on?
I have two containers running on a host. When I’m in container A I want to run a diff on container B compared to it’s image to see what has changed in the filesystem. I know this can be ran easily from the host itself, but I’m wondering is there any way of doing this from inside container A,…
Trickle error :- failed:connection refused
I have an Azure Iot Hub endpoint where I have to send some data (consider small strings). I want to set the speed of sending the data to that url and am using Trickle to achieve that. I thought will do the work, but it is showing failed: Connection refused Also tried like this: But still getting the same erro…
Not loading firefox on selenium webdriver
Everything is installed. When i type firefox in terminal, it perfectly opens firefox browser. Help me!! Answer FirefoxDriver for Selenium has been discontinued. You must use MarionetteDriver/geckodriver.
How to setup a ssh connection to connect only via the localhost
We have a Linux Server with 2 users user1 and user2. We have to login from user1 to user2 via ssh such as: Both users are on the same server. However, user1 is an automated script where we cant type in manually the password and we dont want to store the password. Therefore, we want to use an ssh key
[Linux | Cscore]avutil-55 DllNotFoundException
I am trying to run my application which uses cscore (https://github.com/filoe/cscore) and its sub namespace “CSCore.Ffmpeg” I’ve already tried what the author explained in “https://github.com/filoe/cscore/blob/master/CSCore.Ffmpeg/Readme.md” (‘LD_LIBRARY_PATH=./ mono MyApp.…
Cannot redirect python script output to infile
I am working on Debian Stable Linux which is otherwise working very well. I have following code in a python script file named “myrev” which works to reverse order of lines of given text file: It works properly and prints out reverse order of lines if I use following Linux command However, if I try…