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

upgraded to linux kernel 4.8

I upgraded my Linux Mint 18.1 to the 4.8 kernel and was left without network and sound. To fix that all I needed to do was to install the linux-image-extra, which I don't remember ever needing to install explicitly:


sudo apt-get install linux-image-extra-4.8.0-52-generic


Saving here because it took me a couple of hours until I got to this solution.

update on Gedit plugin to format JSON

what changed: $j->canonical([1]) - this will sort the keys in the json objects

#!/usr/bin/env perl 

use strict;
use JSON::XS;
local $/ = undef;
my $content = ;

my $j = JSON::XS->new->utf8->pretty(1);
$j->canonical([1]);
my $output = $j->encode($j->decode($content));

print $output;

build dstep on Linux Mint 17.2

while trying to build dstep (a tool to convert C header files to D modules):

$ dub
Running pre-generate commands for dstep...
Performing "debug" build using dmd for x86_64.
dstep 0.2.2+commit.121.gf55746e: building configuration "default"...
Linking...
/usr/bin/ld: cannot find -lclang
collect2: error: ld returned 1 exit status
--- errorlevel 1
dmd failed with exit code 1.

Had all the clang libs (including the *-dev packages) installed but it did not change. Here was the solution:

$sudo su -
#cd /usr/lib/x86_64-linux-gnu
#ln -s libclang.so.1 libclang.so

setting up printer Brother HL-1212W on Linux Mint 17.2

it was underwhelming:

Click on the Mint button-> search for Printers -> add printer -> Network -> wait 1 second until the printer is found and the name is shown -> add it -> pick the recommended driver -> print test page to make sure. Total time: about 3 minutes.

You need to configure it to connect to the wireless network from windows first though.