1  # mkdir /mnt/iso
   2  # mount -o loop -t iso9660 file.iso /mnt/iso

   1  # Create a Rails project
   2  rails project -d sqlite3
   3  cd project
   4  # Delete index file
   5  rm public/index.html
   6  # Use Rails edge. Use  rake rails:freeze:edge TAG=rel_1-2-3 to get a specific version.
   7  rake rails:freeze:edge
   8  # Add Capistrano configuration file
   9  capify .
  10  # Add Mongrel cluster configuration file
  11  sudo mongrel_rails cluster::configure -e production \
  12      --user mongrel --group mongrel \
  13      -c /var/www/project-xxx/current \
  14      -a 127.0.0.1 \
  15      -p 8000  \
  16      -N 3
  17  # Create a Mercurial repository
  18  hg init
  19  # Add project to repository
  20  hg commit -A --message "Project started"
  21  # Push changes to a remote repository
  22  hg push ssh://user@ip:port//var/mercurial/xxx

Cloning is done with hg clone:

   1  hg clone ssh://user@ip:port//var/mercurial/xxx

Use the following command to print a list of changes (revision history) for a Mercurial repository:

   1  $ hg log

The output looks like this:

   1  changeset:   35:5a17500addb5
   2  tag:         tip
   3  user:        christian@localhost
   4  date:        Fri Jun 29 23:33:59 2007 +0300
   5  summary:     Changed mongrel_cluster configuration
   6  
   7  changeset:   34:a73ee17923fe
   8  user:        christian@localhost
   9  date:        Fri Jun 29 23:28:36 2007 +0300
  10  summary:     Fixed bugs.

In the example there are two revisions 35 and 34. Use the following command to display the details for revision 34:

   1  $ hg log -p -r34

The output is a unified diff for the changeset and looks like this:

   1  changeset:   34:a73ee17923fe
   2  user:        christian@localhost
   3  date:        Fri Jun 29 23:28:36 2007 +0300
   4  summary:     Fixed bugs.
   5  
   6  diff -r 4c44552841af -r 4e57a76f51d9 lib/daemons/deleted_unused_tags.rb
   7  --- a/lib/daemons/deleted_unused_tags.rb        Sat Jun 23 23:58:38 2007 +0300
   8  +++ b/lib/daemons/deleted_unused_tags.rb        Sun Jun 24 00:03:43 2007 +0300
   9  @@ -11,10 +11,7 @@ end
  10   end

Vim is a powerful text editor. All powerful text editors support some kind of macro’s. Here’s how vim does it.

   1  qa - start recording a macro into register 'a'
   2  q - stop recording

Running the macro.

   1  @a - run the macro in register 'a'
   2  @@ - repeat the last macro that was run
   3  10@a - run the macro in register 'a' ten times

Bulk operations in mutt, a console based email client, are easy. Here’s how to delete messages containing the keyword ‘Newsletter’.

   1  T
   2  Newsletter
   3  ;
   4  d
   5  $

; – asks which action you want to run on the tagged messages.

d – tells that the action you want is delete.

$ – synchronizes the view with the underlying persistence layer.