I have a source file with two similar yet subtly different sections. I’d like to merge the two sections into one subroutine with a parameter that handles the subtle differences, but I need to be sure I’m aware of them all so I don’t miss any. What I usually do in such cases is copy each of t…
Tag: linux
Execute several programs at the same time in an initialisation/bash script
Hello I am working with a simulator that uses rcS scripts to boot, this is my script What I want is run all the test at the same time and that the exit command is executed only when all the previous test have finished. And not only when test 4 has finished, is this possible?. Thank you. Answer You can
Using Windows DLL from Linux
We need to interface to 3rd party app, but company behind the app doesn’t disclose message protocol and provides only Windows DLL to interface to. Our application is Linux-based so I cannot directly communicate with DLL. I couldn’t find any existing solution so I’m considering writing socket…
What is the safest way to empty a directory in *nix?
I’m scared that one day, I’m going to put a space or miss out something in the command I currently use: Is there a safer way of emptying the current directory’s contents? Answer The safest way is to sit on your hands before pressing Enter. That aside, you could create an alias like this one …
How to do multiline search and replace with a script?
I’m trying to replace every multiline import inside a Python source file.. So, the source goes like and I’d like to get something like I tried to use sed but it looks like it doesn’t support non-greedy matching of the closing parenthesis, so it “eats” the second import.. 🙁 Any hi…
Network usage top/htop on Linux [closed]
Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. This question does not appear to be about a specific programming problem, a software algorithm, or software tools primarily used by programmers. If you believe the question would be on-topic on another Stack …
How to instruct cron to execute a job every second week?
I would like to run a job through cron that will be executed every second Tuesday at given time of day. For every Tuesday is easy: But how to make it on “every second Tuesday” (or if you prefer – every second week)? I would not like to implement any logic in the script it self, but keep the …
Linux: retrieve per-interface sent/received packet counters (ethernet, ipv4, ipv6)
On Linux, how can I (programmatically) retrieve the following counters on a per-interface basis: Sent/received ethernet frames, Sent/received IPv4 packets, Sent/received IPv6 packets. Answer You should be able to do this using iptables rules and packet counters, e.g. And to view the stats, parse the output of…
Maximum number of threads per process in Linux?
What is the maximum number of threads that can be created by a process under Linux? How (if possible) can this value be modified? Answer Linux doesn’t have a separate threads per process limit, just a limit on the total number of processes on the system (threads are essentially just processes with a sha…
ld cannot find an existing library
I am attempting to link an application with g++ on this Debian lenny system. ld is complaining it cannot find specified libraries. The specific example here is ImageMagick, but I am having similar problems with a few other libraries too. I am calling the linker with: ld complains: However, libmagic exists: Ho…