Find files containing a text under OSX or Linux

There are two methods I mainly use to find a text in multiple text files i.e. my project directory. If one is just generally looking for any file that may contain the text snippet I use grep:

grep -r "some_method_name" .

This will search all files recursively in your current path. If you only want to search in a sub directory from your current path just replace the dot with the path to the sub folder e.g.: grep -r "some_text" my/log/files

If I know or only want to see it for a certain type of file I’ll use find and xargs e.g. like this:

find . -name "*.erb" | xargs grep "some_method_name"

Again if you only want to search in a given sub directory just replace the dot with the path to the sub folder.

I found these two little bash lines real time savers!

Fixing Ruby pry/readline under Ubuntu

Disclaimer: I don’t know why this error occurred on my office installation of Ubuntu 10.04 but this is what I did to solve it.

After installing pry (with a RVM ruby version) and wanting to run it I got the following error block:

mallibone@troulwd0062:~$ pry
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:11: warning: already initialized constant DEFAULT_HOOKS
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:22: warning: already initialized constant DEFAULT_PRINT
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:47: warning: already initialized constant SIMPLE_PRINT
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:56: warning: already initialized constant CLIPPED_PRINT
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:61: warning: already initialized constant DEFAULT_EXCEPTION_HANDLER
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:67: warning: already initialized constant DEFAULT_EXCEPTION_WHITELIST
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:70: warning: already initialized constant DEFAULT_PROMPT
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:81: warning: already initialized constant SIMPLE_PROMPT
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:83: warning: already initialized constant SHELL_PROMPT
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:90: warning: already initialized constant NAV_PROMPT
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:106: warning: already initialized constant DEFAULT_CONTROL_D_HANDLER
/home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:120: warning: already initialized constant DEFAULT_SYSTEM
/home/users/mallibone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- readline (LoadError)
        from /home/users/mallibone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/lib/pry.rb:163:in `'
        from /home/users/mallibone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /home/users/mallibone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require'
        from /home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/bin/pry:12:in `rescue in '
        from /home/users/mallibone/.rvm/gems/ruby-1.9.3-p125@global/gems/pry-0.9.8.2/bin/pry:8:in `'
        from /home/users/mallibone/.rvm/gems/ruby-1.9.3-p125/bin/pry:19:in `load'
        from /home/users/mallibone/.rvm/gems/ruby-1.9.3-p125/bin/pry:19:in `'

Now the line that shows us the error is this one:

/home/users/mallibone/.rvm/rubies/ruby-1.9.3-p125/lib/ruby/site_ruby/1.9.1/rubygems/custom_require.rb:36:in `require': cannot load such file -- readline (LoadError)

So we have a readline error. No need to click onto that link and go off reading just keep in mind that this library does the following:

The GNU Readline library provides a set of functions for use by applications that allow users to edit command lines as they are typed in.

But back to the original problem, how do we get it running? Well in your Ruby installation there is a extconf.rb file which according to the read-me: The Readline module provides interface for GNU Readline.. So what we have to do now is update our installation i.e. update this wrapper module. I’m using RVM so I found the file under the path[1]:

/home/users/mallibone/.rvm/src/ruby-1.9.3-p125/ext/readline

To update our wrapper cd into your readline directory and run the following commands:

ruby extconf.rb
make
sudo make install

The typing pry into the shell resulted in the rewarding response:

[1] pry(main)>

Update

Under Ubuntu 11.10 you have to further install libreadline library to get pry and AFAIK the rails console. One way to do this is by the following lines (again using RVM):

rvm uninstall 1.9.3-p125
sudo apt-get install libreadline-dev
rvm install 1.9.3-p125 --with-readline-dir=/usr/include/readline

Thank you megas for pointing out this issue under Ubuntu 11.10 and providing a good explanation and solution to the problem.

Resources:

Readline LoadError Solution
GNU Readline

—

[1] If you don’t know where or what kind of installation you have type cd / into your command line and then

find . -name "extconf.rb"

This should show you where your extconf.rb file is but may take a while looking for it.

SVN revert equal in Git

Using git, coming from SVN and want to revert changes on a file? In SVN it used to be:

svn revert filename

Well revert in git isn’t what you want to do in this case. Due to it’s local repository you have to think a bit different here. When checking out you get the latest committed version from your local repository, so what you actually have to do is the following:

git checkout filename

Now you have the equivalent to the gold old revert.

git svn status

Working with git-svn and need to know what your svn status would look like? Well within two lines you could be there. First make sure that your remotes/git-svn is up to date:

git svn fetch

Now you can a diff over that branch:

git diff --name-status remotes/git-svn

You should now see your standard diff. In case this didn’t work or your not sure where your default branch is lying, enter the command:

git branch -a

This will show you all your local and remotely tracked branches. Which looked in my case like this:


* master
remotes/git-svn


Using OS X FileMerge with Git

On OSX Apple gives us the ever so useful FileMerge tool, which is my prefered tool to use when comparing two versions of a single file in OS X. To use this tool when working with Git simply open a terminal and enter the following command

git config --global merge.tool opendiff

This will open up FileMerge whenever Git has a conflict and needs your decision on what needs to be taken i.e. used.

Replacing Notepad with Notepad2 on Windows 7 64-bit

Late to the show but here I am, using notepad2 as my default notepad editor. I like the additions that notepad2 gives me over notepad and thereby delivering an equal snappy feeling when I open up a file with it. But replacing it as my default notepad on my Windows 7 64 Bit version took me more time than I am willing to admit.. So I thought I might well jot my solution down. I took my instructions from the notepad2 official webpage and Simon Steeles description on how to install his Programmer’s Notepad on a 64-bit Windows machine.First of all download a x64 version of the notepad2 then drag the folder into your program folder (on my machine C:\Program Files (x86)\notepad2). Now create a batch file (due to permissions you may want to first store it on your desktop and then drag it into the folder..):

reg add “HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\notepad.exe” /v “Debugger” /t REG_SZ /d “\”%~dp0Notepad2.exe\” /z” /f

Run the batch file (as Administrator) in your notepad2 directory. Now notepad2 should be your default editor.To reverse the step above run this batch script (again as Administrator):

reg delete “HKLM\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\notepad.exe” /f