A short, *easy-er* to remember command for stripping whitespace and comments from a config file, (or any file for that matter).

Remember regex as:

slash, space, star.

pound, slash, bar.

pointy-hat, dollar. (or "caret, dollar" if you must)

:-P

Skype has an internal regex which depicts the emoticons it supports. However you cannot simply search the binary file for it. This small 181 character line will do just that, provided skype is running. And of course, only works in linux.

get desired info from machine and pipe it txt file.

Uses logger in a while loop to log memory statistics frequently into the local syslog server.

additionally use "find /etc/cron*" for cronscripts

I had some trouble removing empty lines from a file (perhaps due to utf-8, as it's the source of all evil), \W did the trick eventually.

Using the grep command, retrieve all lines from any log files in /var/log/ that have one of the problem states

This set of commands was very convenient for me when I was preparing some xml files for typesetting a book. I wanted to check what styles I had to prepare but coudn't remember all tags that I used. This one saved me from error-prone browsing of all my files. It should be also useful if one tries to process xml files with xsl, when using own xml application.

find all email addresses in a file, printing each match. Addresses do not have to be alone on a line etc. For example you can grab them from HTML-formatted emails or CSV files, etc. Use a combination of

to filter them.

Good for summing the numbers embedded in text - a food journal entry for example with calories listed per food where you want the total calories. Use this to monitor and keep a total on anything that ouputs numbers.

This will extract all of the urls from a firefox session (including urls in a tab's history). The sessionstore.js file is in ~/.mozilla/firefox/{firefox profile}

This expression looks for groups inside of a GroupOfNames class element, that is itself inside one (or many) Organizational Unit (ou) nodes in the ldap tree. Give you a quick dump of all the groups the user belongs to. Handy for displaying on a webpage.

use to execute a block of code only if $var is numeric

Finds all corrupted jpeg files in current directory and its subdirectories. Displays the error or warning found.

The jpeginfo is part of the jpeginfo package in debian.

Should you wish to only get corrupted filenames, use cut to extract them :

Lists revisions in a Subversion repository with a timestamp that doesn't follow the revision numbering order. If everything is OK, nothing is displayed.

Works in Ubuntu, I hope it will work on all Linux machines. For Unixes, tail should be capable of handling more than one file with '-f' option.

This command line simply take log files which are text files, and not ending with a number, and it will continuously monitor those files.

Putting one alias in .profile will be more useful.

The variable WIRELESSINTERFACE indicates your wireless interface

Note that this assumes the application is an SVN checkout and so we have to throw away all the .svn files before making the substitution.

exported files will get a .r23 extension (where 23 is the revision number)