While (endless, stop: CTRL+C)

while : 
 do 
  date
  echo "Hello "
  sleep 5
 done

Alternativ:

while : ; do date; echo "Hello "; sleep 6; done

For (5x):

for i in {1..5}
do
   echo "Number is $i "
   sleep 2
done

 Alternativ 1:

for i in {1..5}; do echo "Number is $i "; sleep 2; done

 Alternativ 2:

for i in {1..5}; do echo "Number is $i " && sleep 2; done

Search for BERLIN in a very big file

cat very-big-bigfile.txt | grep -o -P '.{0,33}BERLIN.{0,44}'

1 * * * * wget -O /dev/null -o /dev/null my-example-website.com

1. Search / Grep  content of files in all-documents/
2. Move files containing africa to documents-africa/

grep -siRlI 'africa' all-documents/ | xargs mv -t documents-africa/

tar --exclude='./dir2ignore' --exclude='./cache_etc' -zcvf /backup/myarchive.tar.gz .

So geht es:

drush php-eval 'my_custom_module_cron();'

Controller könnte so aussehen:

<?php

class myController extends ControllerBase
{
    public function myFunc1()
    {
        $html = " ... ";
        return [
            '#type' => 'inline_template', 
            '#template' => '{{ html|raw }}', 
            '#context' => ['html' => $html]
        ];
    }
}

Command 1:

drush sql:dump  | gzip -c > /home/backup/db-$(date +%Y-%m-%d-%H%M).sql.gz

Error:

mysqldump: Error: 'Access denied; you need (at least one of) the PROCESS privilege(s) for this operation' when trying to dump tablespaces

Lösung:

drush sql:dump --extra-dump=--no-tablespaces

Code:

 find / -name art  2>&1 | grep -v "Permission denied"

*** [WARN] *** Your open file limit is currently 1024. It should be set to 65000 to avoid operational disruption.

If you no longer wish to see this warning, set SOLR_ULIMIT_CHECKS to false in your profile or solr.in.sh