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• 05:31:19 pm on February 12, 2013 | 0 | # |
  Tags: Apache, config, Ubuntu
  

  Check apache2 enabled modules:

  $ sudo apache2ctl -M Loaded Modules: core_module (static) log_config_module (static) logio_module (static) mpm_prefork_module (static) ...

  mod_rewrite (rewrite_module usually manipulated in .htaccess) and ssl (for HTTPS) for examples aren’t enabled by default in Ubuntu’ installation of apache2.

  Enable one or more of them via:

  $ sudo a2enmod

   

• 11:31:47 am on July 19, 2012 | 0 | # |
  Tags: backup-restore, manipulation, workaround
  

  Restoring a production database into VM and change date to make it looks like some point of time inside the production server i.e. in this case May 4, 2010

  $ /etc/init.d/mysqld stop $ /etc/init.d/httpd stop $ date +%D -s 2010-05-04 $ date +%T -s 23:00:00 -u

  Check date

  $ date Tue May 4 19:00:01 EDT 2010

  Import database

  /etc/init.d/mysqld start /etc/init.d/httpd start mysql -u some-username -p < some-db.sql

  Note: Hardware clock option in the VirtualBox VM setting is disabled

   

• 11:49:45 am on March 8, 2012 | 0 | # |
  Tags: key, RSA, ssh
  

  Check ssh key RSA fingerprint:

  $ ssh-keygen -l -f /home/myusername/.ssh/id_rsa.pub 7b:e5:6f:a7:xx:xx:xx:xx:xx:xx:xx:xx:8b:57:xx:xx /home/myusername/.ssh/id_rsa.pub (RSA)

   

• 08:35:25 am on January 28, 2012 | 0 | # |
  Tags: emulator, Windows, wine
  

  Running separate version of wine in separate config directory (to isolate errors of running or installation failure)

  env WINEPREFIX="/home/arif/.wine-newapps" /usr/local/bin/wine-1.1.31/usr/bin/wine /home/arif/.wine-newapps/drive_c/Program\ Files/newapps/newapps.exe

   

• 01:44:07 pm on January 25, 2012 | 0 | # |
  Tags: regexp, shell script
  

  grep omit empty lines:

  cat <something> | grep -v "^$"

  I keep forgetting this regexp of “match expression at the star of the line”: the “^”

   

• 09:50:01 am on January 11, 2012 | 0 | # |
  Tags: script, startup
  

  Custom run level init.d script:

  startup script on run level 0 and 6, as 34th start only e.g.

  update-rc.d which-tty start 34 0 6 .

  will create

  /etc/rc0.d/S34which-tty /etc/rc6.d/S34which-tty

   

• 06:39:59 am on January 10, 2012 | 0 | # |
  Tags: device, shell script
  

  Checking whether /dev/video0 or /dev/ttyUSB0 exists or not (module is installed & probed). They're recognized as "character special file" in bash

  [ -b /dev/ttyUSB0 ] && echo "char special file found" || echo "char special file not found"

  Compare the above to "block special file"

  [ -b /dev/sda ] && echo "block special file found" || echo "block special file not found"