almost done with stretching matrices

Almost done with stretching (same as scaling but less high-brow) matrices https://bitbucket.org/emilper/zug-matrix.

Also perfected a method to write correct code while very tired: write tests with what you expect to get while still awake, then scramble the code around until you stumble upon a not-completely-disgusting solution and the tests pass. Maybe I should pattent it ?

DBD::mysql failing with mariadb on debian/ubuntu/friends

If installing DBD::mysql build fails on debian/ubuntu/etc. when you have mariadb-server installed, you might need libmariadb-dev-compat .

getting tired of being victimized by overeager JS developers I am taking a hard look at Javascript/Node environment

to keep it real and eat my own dog food I published some code on npm https://www.npmjs.com/package/matrix-mab

may the FSM have mercy of my developer karma :)

dlang - retrieve struct from void pointer passed to extern (C) function

struct Data {
    int depth;
}

extern (C) void startElement(void* userData, const(char)* name, const(char*)* atts) nothrow
{

    Data user_data = (*cast(Data*) userData);
    user_data.depth++;
    // and so forth

I do not know if this is the right way to do it but it seems to work.

count unique values in rows with bash, grep and awk

cat /some/file/path.txt | awk '{ print $5}' | uniq -c 

backup sites with cron and ssh

# m h dom mon dow command

33 0 * * *   /usr/bin/ssh root@lunch-break.ro "/bin/tar czf - /home/www/bla " > \
 /home/emilper/backup/bla/www_bla_`date +\%Y-\%m-\%d_\%H-\%M-\%S`.tar.gz 2>>/tmp/cron.log 
52 0 * * *   /usr/bin/ssh root@lunch-break.ro "mysqldump -u root -pblabla --opt bla_db | \
 gzip -9c " > /home/emilper/backup/bla/bla_db_mysql_dump_`date +\%Y-\%m-\%d_\%H-\%M-\%S`.gz \
 2>>/tmp/cron.log 

perl compiled under 5 minutes with perlbrew on a Ryzen 7

emilper@home ~ $ time perlbrew install -j8 -Dusethreads -Duselargefiles -Dcccdlflags=-fPIC -Duse64bitint -Dpager=/usr/bin/sensible-pager -Uafs -Ud_csh -Ud_ualarm -Uusesfio -Uusenm -Doptimize=-O2 -Duseshrplib perl-5.20.3
Installing /home/emilper/perl5/perlbrew/build/perl-5.20.3 into ~/perl5/perlbrew/perls/perl-5.20.3

This could take a while. You can run the following command on another shell to track the status:

tail -f ~/perl5/perlbrew/build.perl-5.20.3.log

perl-5.20.3 is successfully installed.

real 3m50.827s
user 10m8.356s
sys 0m39.784s