Snipplr

(Bash) Rescue any exception in Ruby - cczona

Thu, 20 Oct 2011 14:59:24 UTC

From the Pickaxe, 4th edition, p. 352: A rescue clause with no parameter is treated as if it had a parameter of StandardError. This means that some lower-level exceptions will not be caught by a parameterless rescue class. If you want to rescue every exception, use this:

(Bash) List the keyboard shortcuts for your *nix\'s builtin functions - cczona

Wed, 07 Sep 2011 07:34:29 UTC

See also http://www.gnu.org/software/bash/manual/bashref.html#Bindable-Readline-Commands for the standard bindings and more detailed explanation of what they do.

(Bash) Import exported/dumped Subversion repository - cczona

Sat, 16 Jul 2011 04:09:27 UTC

(Bash) Undoing (reverse merging) changes/versions in Subversion - cczona

Sat, 04 Dec 2010 12:24:25 UTC

[See also: http://snipplr.com/view/12048] Oops, didn't mean to commit that? Undo it easily:

(Bash) Count files recursively - cczona

Mon, 08 Nov 2010 19:15:32 UTC

(Bash) Extract/export graphics from Flash *.swf file - cczona

Sat, 31 Jul 2010 04:20:31 UTC

Examples borrowed from http://ubuntuforums.org/showthread.php?t=966877 (comment 3)

(Bash) Identify version of Flash plugin required by an *.swf file - cczona

Sat, 31 Jul 2010 04:05:00 UTC

requires swftools

(Bash) Strip EXIF headers from the commandline - cczona

Tue, 18 Aug 2009 22:38:32 UTC

After ImageMagick is installed, you will have /usr/bin/mogrify available. The mogrify command can be used to strip Exif data from images.

(Rails) Call ActionController methods from the Rails console - cczona

Fri, 13 Mar 2009 15:33:39 UTC

The 'request' and 'response' objects are chock full of useful info. But console can't usually access them. Here's how: start the server with the -u option, insert a breakpoint where you would like to have access to the controllers/helpers/etc. When finished, just type 'cont' to continue execution

(SVN) SVN reverse (revert) commit - cczona

Mon, 09 Feb 2009 18:35:57 UTC

[See also: http://snipplr.com/edit/45271] Oops, didn't mean to commit that? Undo it easily:

(Bash) Install ClamAV from source on OS X - cczona

Sun, 10 Aug 2008 02:52:37 UTC

(Other) port install ruby -> malloc error - cczona

Thu, 10 Jul 2008 04:35:47 UTC

'port install ruby' sometimes results in malloc errors near the final phase (just after destroot completes). It appears that macports may be out of memory while installing documentation.

(Bash) Point subversion working copy to moved repository URL - cczona

Mon, 23 Jun 2008 13:48:01 UTC

(JavaScript) Confirm that jQuery has loaded - cczona

Thu, 12 Jun 2008 17:03:10 UTC

(Bash) Combine PDFs with Ghostscript - cczona

Fri, 30 May 2008 15:36:24 UTC

There's a GUI tool, called Combine PDF, which purports to do the same thing. But the output loses text searchability. Whereas this method preserves searchability. NOTE: you may need to do 'sudo port install ghostscript' first

(Bash) Add paths to Ruby 'require' - cczona

Mon, 12 May 2008 17:52:58 UTC

Suppose you created a script chart.rb in /home/foo/ruby/mylib direcory. Now, you want to use this in the app.rb located in /home/foo/ruby/scripts. In ~/.bash_profile:

(Bash) Dig, without the cruft - cczona

Tue, 29 Apr 2008 04:03:42 UTC

If you pass the +short option to dig, it will give you a really short and sweet answer - just the IP address. $ dig fosswire.com +short 208.113.149.33

(Bash) Customize SSH config for every login - cczona

Fri, 25 Apr 2008 14:02:30 UTC

Changing default settings The defaults for the ssh-related commands can be altered for each account in a configuration file ~/.ssh/config (there is also a system-wide file, usually /etc/ssh/ssh_config). Each entry starts with a Host keyword. You can use wildcards to match all the appropriate systems: * ? matches any single character * * matches any sequence of zero or more characters Usual keywords include (defaults in parenthesis): Compression yes/no (no) Controls whether compression is used on the connection. CompressionLevel 1-9 (6) Level of compression: 1 is fastest, 9 is slowest (achieves best compression). Compression is good for slow links (saves bandwidth) and fast machines. FallBackToRsh yes/no (yes) If a secure connection to the remote system cannot be established the commands can try unsecure connections (a warning will be displayed if this happens). On highly secure systems this could be disabled in the system-wide configuration. KeepAlive yes/no (yes) Controls whether TCP keepalive messages are used. When enabled it is possible to detect network outages and automatically close your connections (which is good). However, if you are connected over a dialup link that automatically dials when there is traffic, you will want to turn this off to avoid unnecessarily bringing up the line. User account (local account) Specify the remote account name. Add this to avoid having to use the -l option when issuing commands. For a complete list of options see sshd_config(5): http://netbsd.gw.com/cgi-bin/man-cgi?sshd_config+5 NOTE: Host can alternately set an alias name for a Hostname

(Bash) What records does this nameserver have for a given domain? - cczona

Wed, 16 Apr 2008 16:27:22 UTC

Use 'host NAME SERVER' where: * 'NAME' is some base domain name you want to know more about * 'SERVER' is the IP address of a nameserver to be queried (typically you'll want to use one of the nameserver for the name you're inquiring about)

(Bash) Use shopt to reference bash paths as variables - cczona

Sat, 05 Apr 2008 18:48:37 UTC

Check out the bash command 'shopt -s cdable_vars' From the man bash page: If set, an argument to the cd builtin command that is not a directory is assumed to be the name of a variable whose value is the directory to change to.

(Bash) Which version of Linux is this? - cczona

Thu, 03 Apr 2008 21:14:02 UTC

(EDITED: Originally I had this snip using 'cat /proc/version'. But have since replaced it with a more reliable -- and specific -- method) If you need still more info (or are on a BSD), see 'uname', 'dpkg-architecture'

(Bash) Parallels bridged networking with Ubuntu Server - cczona

Thu, 03 Apr 2008 17:51:29 UTC

If Ubuntu Server fails to resolve hostnames or find a network connection via Parallels 3 bridged networking, it may be attempting to use the wrong network interface.

(Bash) 1440x900 (24 bit) display resolution for Ubuntu Server - cczona

Thu, 03 Apr 2008 17:23:42 UTC

(Ruby) Irb power tricks with Wirble & Utility-Belt - cczona

Fri, 28 Mar 2008 12:24:12 UTC

Note: most of these will be available to the shell and Rails' console too.

(Rails) Rails link to an image instead of text - cczona

Fri, 28 Mar 2008 11:49:22 UTC

(Ruby) Haml 'nesting within a tag' error - cczona

Fri, 28 Mar 2008 11:28:26 UTC

"When using haml, an HTML tag is represented using %tagname, but in the case of an HTML tag with attributes, the representation is %tagname{:attribute => value}. It turns out there must be no whitespace between %tagname and {:attribute => value}. This was the source of a lot of errors when I was trying to write haml forms, since the error message was the cryptic: Illegal Nesting: Nesting within a tag that already has content is illegal."

(Rails) Rendering partials in Rails 2.0 - cczona

Fri, 28 Mar 2008 05:08:36 UTC

"The new naming scheme for template (eg. .html.erb) does not seem to work for partials. When using :partial => 'form' a filename "_form.html.erb" is not recognized. " Rails now requires the partial to be referenced by dotted format

(JavaScript) IE sniffer using conditional compilation - cczona

Tue, 25 Mar 2008 21:09:46 UTC

Note that the comment is part of the code here. IE 5+ (including Mac) will evaluate to true by using conditional compilation.

(Ruby) order/format of params in method definition - cczona

Mon, 24 Mar 2008 22:41:16 UTC

See also p. 348 ("Invoking a Method") of Pickaxe 2nd edition

(Ruby) What version of Ruby and Rails is this using? - cczona

Mon, 24 Mar 2008 14:25:44 UTC

(Other) IE 7/8 'No Add-Ons Mode' - cczona

Fri, 21 Mar 2008 02:22:45 UTC

IE7 and IE8 support â€œNo Add-ons Mode,â€ a troubleshooting mode. When you run IE this way, no 3rd party code runs... You can start No Add-ons Mode in a few ways: (To exit No Add-ons Mode, simply close that browser window.)

(JavaScript) object methods gotcha with DOMAssistant - cczona

Tue, 18 Mar 2008 05:32:42 UTC

*"Only the elements which are are selected through the $ selector will get the extra DOMAssistant methods added to it."

(Ruby) Ruby heredoc tricks - cczona

Fri, 14 Mar 2008 19:31:08 UTC

Following a

(Ruby) Use regex to match a Ruby substring, and reference it like an index - cczona

Thu, 13 Mar 2008 21:41:41 UTC

(Ruby) optimize Ruby memory usage by avoiding string accumulation - cczona

Thu, 13 Mar 2008 18:55:05 UTC

(Ruby) make Ruby strings behave like files - cczona

Thu, 13 Mar 2008 18:38:19 UTC

This is handy for testing, when you need to simulate an open file or open URI. Why, and the Pickaxe book, have better examples

(Other) parse URI object, and fetch response from it, in one step - cczona

Thu, 13 Mar 2008 16:26:14 UTC

URI objects can be opened directly by open-uri

(Ruby) Execute arbitrary code with different level of error messaging - cczona

Thu, 13 Mar 2008 03:27:01 UTC

You can turn off warnings for a section of your code by setting $VERBOSE to nil. Even better is to codify this in a method. Since this method takes a block as its parameter, you can now pass it arbitrary chunks of code to execute without warnings.

(Ruby) 'uninitialized constant Gem::GemRunner' - cczona

Thu, 13 Mar 2008 00:00:08 UTC

(Ruby) CGI library gotcha - cczona

Wed, 12 Mar 2008 23:58:07 UTC

Beware of requiring 'CGI'. There's trouble in them thar hills/

(Bash) MacPorts fixer-upper - cczona

Wed, 12 Mar 2008 20:33:25 UTC

Forces a recalcitrant port to install by *uninstalling* it completely first

(Bash) shopt (shell options) - cczona

Wed, 12 Mar 2008 20:31:38 UTC

//for options available, see: http://www.ss64.com/bash/shopt.html

(Bash) Apache 'Forbidden' error on Mac ~/Sites files - cczona

Sat, 19 Jan 2008 14:36:23 UTC

When Apache under OS X throws 'Forbidden' errors on files under the ~/Sites path, and the error log report 'Permission denied: access to /somefile/blah failed because search permissions are missing on a component of the path', check a missing Other Execute permission along the entire path. "If you want someone to have access to a file in a particular folder, that user must have "search" permission (the "x") on all of the folders along the path from the top of the drive down to the folder where the file is. And then the file itself must have "read" permission for that user. And if you want someone to be able to see what files are in a particular folder, that folder must have "read" permission for that user."

(Other) TextMate::UI has replaced Dialog - cczona

Fri, 28 Dec 2007 18:07:24 UTC

(Rails) `No such file or directory â€“ /tmp/mysql.sock` - cczona

Mon, 24 Dec 2007 14:59:23 UTC

(Other) TiVo navigation shortcuts - cczona

Sun, 23 Dec 2007 13:01:48 UTC

(Other) remove Rails vendor files etc from TextMate project search - cczona

Sat, 22 Dec 2007 19:26:38 UTC

Preferences > Advances > Folder References

(Bash) check swap memory usage - cczona

Sat, 22 Dec 2007 01:48:47 UTC

To find out how much swap you are using at any given time. If there's more than 1 swapfile you could benefit from more RAM.

(Bash) GOTCHA: bash/sh handling of unclosed quotes - cczona

Fri, 21 Dec 2007 17:45:49 UTC