Category Archives: Programming

Material related to computer programming.

Bash aliases

Posted on by
Reply

I was reading my default .bashrc file, and found the following:

# Alias definitions.
# You may want to put all your additions into a separate file like
# ~/.bash_aliases, instead of adding them here directly.
# See /usr/share/doc/bash-doc/examples in the bash-doc package.

if [ -f ~/.bash_aliases ]; then
    . ~/.bash_aliases
fi

This suggested that I wanted a .bash_aliases file for my aliases, so I set one up:

jj5@sixsigma:~$ cat .bash_aliases
alias home='cd ~'
alias jj5='cd /var/www/www.jj5.net/'
alias profile='cd /var/www/www.jj5.net/profile/'
alias chomsky='vim /var/www/www.jj5.net/profile/chomsky/index.html'
alias henney='vim /var/www/www.jj5.net/profile/henney/index.html'
alias lakoff='vim /var/www/www.jj5.net/profile/lakoff/index.html'
alias norvig='vim /var/www/www.jj5.net/profile/norvig/index.html'

This is my basic “CMS” system for http://www.jj5.net/profile/.

Important: JavaScript does not have block scope.

Posted on by
6

I’m a little embarrassed to say that I only looked this up for the first time today. Although, I’ve been programming in JavaScript for so long that I must have known this years ago, but “forgotten” as I haven’t done much JavaScript programming in the last few years. Hey, at least I retained that niggling feeling like I had to look that up!

Important: JavaScript does not have block scope.

Basically:

 var x = 1;
 { var x = 2; }
 print( x ); // outputs 2

Failed To Read Auto-Increment Value From Storage Engine – MySQL

Posted on by
Reply

Recently after my hosting provider hard-booted one of my machines the MySQL service started to complain “Failed To Read Auto-Increment Value From Storage Engine” when an insert was issued to any table with an auto increment field. I found the solution here, and it basically requires you to reset the auto increment key on the table, like this:

ALTER TABLE `table_name`  AUTO_INCREMENT =1

I had to do that on all of my tables that had auto increment keys to resolve the issue.

phpMyAdmin $cfg[‘Servers’][$i][‘tracking_version_auto_create’]

Posted on by
Reply

I found the configuration setting in the documentation that will force phpMyAdmin to automatically track tables during and after creation. It is:

 $cfg['Servers'][$i]['tracking_version_auto_create'] boolean

And the default value is ‘false’. I updated:

 /var/www/www.progclub.org/pcma/config.inc.php

With the line:

  // JE: 2011-09-07: force tracking
  $cfg['Servers'][$i]['tracking_version_auto_create'] = true;