Tips and Tricks

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No space left on device

For MS Windows 10:

net stop "Windows Search"
del %PROGRAMDATA%\Microsoft\Search\Data\Applications\Windows\Windows.edb
net start "Windows Search"

Positive returncode in makefile

diff -w -y --suppress-common-lines --width=32  bf.tmp pn.tmp || :

Change default codepage of Windows console to UTF-8

Convert MediaWiki to GitHub's MarkDown

Running Delphi programs under Linux

  • Install wine and xvfb for headless terminals.
  • For Intraweb applications, determine a free port, for example 8080.
  • Create and fill a MySQL database on the Linux server, and configure that database in the Delphi application.
  • Move the delphi.exe together with libmysql.dll (version 5.59 extracted from a MySQL-Windows-Distribution) to some directory under Linux.
  • xvfb-run wine delphi.exe, then Ctrl-Z and bg
  • Open the application in a browser with the URL$/.


  • perl -MCPAN -e shell, autoconfig follows
  • amend environment:
PATH="/home/User/perl5/bin${PATH:+:${PATH}}"; export PATH;
  (add "/home/User/perl5/bin" to PATH)
PERL5LIB="/home/User/perl5/lib/perl5${PERL5LIB:+:${PERL5LIB}}"; export PERL5LIB;
PERL_MB_OPT="--install_base \"/home/User/perl5\""; export PERL_MB_OPT;
PERL_MM_OPT="INSTALL_BASE=/home/User/perl5"; export PERL_MM_OPT;
  • install bigint

Rosetta Coding

Debian dist-upgrades

Wheezy to Jessie

  • Ignore:
Setting up makedev (2.3.1-93) ...
/run/udev or .udevdb or .udev presence implies active udev.  Aborting MAKEDEV invocation.
/run/udev or .udevdb or .udev presence implies active udev.  Aborting MAKEDEV invocation.
/run/udev or .udevdb or .udev presence implies active udev.  Aborting MAKEDEV invocation.
  • Ignore:
update-initramfs: Generating /boot/initrd.img-3.2.0-6-amd64
W: mdadm: unchecked configuration file: /etc/mdadm/mdadm.conf
W: mdadm: please read /usr/share/doc/mdadm/README.upgrading-2.5.3.gz .
W: mdadm: no arrays defined in configuration file.
  • Apache2: rename all in /etc/apache2/sites-available to *.conf, remove the symlinks in sites-enabled/ and recreate them with a2ensite; clear the browser cache thereafter.

Raspberry PI keyboard rate

TP-Link DHCP without Internet



java -cp /usr/share/tomcat8/lib/catalina.jar org.apache.catalina.util.ServerInfo
Server version: Apache Tomcat/8.5.38 (Debian)
Server built:   Feb 26 2019 20:37:51 UTC
Server number:
OS Name:        Linux
OS Version:     5.10.103-v7+
Architecture:   arm
JVM Version:    11.0.15+10-post-Raspbian-1deb10u1
JVM Vendor:     Raspbian


  • Subdomains www must be enabled in the menue of the hosting service.
  • Cf. How to redirect for .htacess configuration.