I wrote a self-defined OpenSSL engine and engine tester in ubuntu 20.4. And the OpenSSL version is 1.1.1. The goal is to use engine in TLS session, and the first step is to use command line to sign a digest. The reference website is: https://wiki.openssl.org/index.php/Creating_an_OpenSSL_Engine_to_use_indigenous_ECDH_ECDSA_and_HASH_Algorithms But the tester use the engine by calling the function, like ECDSA_sign and ECDSA_verify in
Systemd – How to trigger another unit while reloading a service?
I’m currently facing the issue that I want to trigger a Systemd unit when another unit get reloaded – not restartet. This is what I achived so far: But that is only working using systemctl restart teleport. Reload doesn’t work. How can this be achived without touching the original teleport.service unit? Answer Found out that this can be easily achived
will cmake build type RelWithDebInfo strip symbol table?
I was building a shared library using cmake with RelWithDebInfo build type, the output .so file has no symbol table. I inspect the output .so file with readelf -S myoutput.so | grep -i debug with gives me nothing. If I change the build type to Debug, the symbol table is there. I suppose RelWithDebInfo is equivalent to -O2 -g, which
I am unable to type cast string to integer in csh
I want to fetch out ‘-0.5’ from the file example.txt and add 1 to it. Although I am able to fetch out ‘-0.5’. but I am unable to add 1 to it, maybe because -0.5 is considered as a string and not a integer. Code: Obtained Result: Expected Result: How do I type cast -0.5 to integer? Answer csh doesn’t
Is there any way to auto-send a “no” response to a script?
For example, I have this script: I can run yes | bash script and the script will automatically output “yes” I want to know if I can send a negative response to it and automatically output “no”. Sorry if this has been asked before but I can’t find anything related. Answer yes repeatedly outputs a string that you give it
C Programming – Counting signals in signal handler
I am working on signals in C programming. I have parent process and 5 child processes, I am trying to send SIGUSR2 from child processes to parent process when they are done some calculations while parent waits for them with sigsuspend(). When all 5 child processes sends SIGUSR2, parent process continues its work. I increment a global variable in the
How to copy a file to all subdirectories?
How can I paste read-me.jpg file into all sub-directories? Here is a command to create a new file in all subdirectories. But I want to copy jpg file into all subdirectories instead. Directory List: already tried with this command but no output Answer You tried to redirect cp’s output into $dir but instead we should specify the destination $dir/read-me.jpg as
Executing single shell script parallelly at same time with different arguments
Consider a script lets say test.sh which accepts file no as argument which process huge files based on argument. So whenever I am executing it as “nohup ./test.sh 01 &” it does the job, I have requirement where same needs to be executed parallelly for 8 files and I am able to achieve that with different arguments. Following are my
Running a python script via crontab does not accept parameters containing %
I have a python script that accepts custom parameters via sys and getopt modules. The cron job looks like: I have narrowed down this problem to the first argument TSX.AP%. This is a parameter that I take to execute a DB query. If I add the wildcard % inside my script, therefore only passing TSX.AP to cron, the crojob works.
Ownership of datadir is reset to mysql:mysql after every reboot
I’m using MariaDB 10.5.9-1 on Manjaro 5.10.23-1. I initialized mariadb database directory using this command: After data directory initialization, permissions and ownership of /var/lib/mysql: And there’s one another directory /run/mysqld, which file mysqld.sock resides in by default when server is up and running, has permissions and ownership: I have no idea when /run/mysqld was created, maybe the first time server