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Repost of #5176: add gb plugin

Calling awk is not necessary here, sysctl has the -n flag to print the value.
Signed-off-by: Clemens Gruber <clemensgru@gmail.com>

Related: #5179

Related: #5179

* `function` keyword removed
 * Fixup the `if` statement and operators

See robbyrussell@b67961d

* Modifies ofd to use alias to open_command instead of shell function with AppleScript

* Add ofd() to OSX plugin to open finder on current directory

* Change `pwd` to $PWD in osx.plugin.zsh
  Suggested by mcornella

* add 'mvn clean install -DskipTests --offline' to speed up maven compile

* update maven plugin README

* Added autocomplete support for local knife file uploads

* Added option to allow for relative path resolution for cookbooks

* Updated _chef_root function to use directory:h

This is useful for listing "cron like" systemd jobs

* Fix arc cover alias

* Fix arc pacth alias

Support bundler

After `hg init` command, sometimes Mercurial does not create `.hg/branch` file so we'll use 'default' as fallback, which is the master branch in Mercurial repositories.
Signed-off-by: Marc Cornellà <marc.cornella@live.com>

Changed `alias gsta='git stash'` to `alias gsta='git stash save'`.

Close #5101