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I need to update rubygems from 1.3.5 to 1.4.2 but apparently rubygems update just updates you to the latest version How can I update to 1.4.2? You can install specific versions of RubyGems using RVM . rvm rubygems 1.4.2 After some research this worked for me: gem install -v 1.4.2 rubygems-update && ruby `gem env gemdir`/gems/rubygems-update-1.4.2/setup.rb If you need to use sudo to install gems then make sure to put a sudo in both calls: sudo gem install -v 1.4.2 rubygems-update && sudo ruby `gem env gemdir`/gems/rubygems-update-1.4.2/setup.rb 来源： https://stackoverflow.com/questions/5393509

We have our master branch that we merge our features into. I need to be able to increment our version on commit/merge to the master automatically as a part of the merge. Is there a way i can do this so that the upped version is committed as a part of this commit without having to have an automatic 're checkout, change, commit' that will effectively double all our commits? You can use git hooks for that. The pre-commit hook specifically. You can create one from the sample in .git/hooks/pre-commit.sample by removing the .sample suffix and editing it. The content of pre-commit will be executed

There are two R directories on my computer: one is /home/R-2.15.2 ,the other is /home/R-2.15.1 , when I input R , I can start R, now I want to know which R is running: 2.15.1 or 2.15.2? Run R --version there's info about version on the first line. Edit: If you ask this question then I bet that R is not running from any of these directories. Check $PATH env variable to get information where binaries are looked for and in which order. Edit 2: Use type shell command to find where binary for given command is stored, -a for all paths, -f for the hashed one (basically: most recently used). In

I'm using R 3.1.0 and can't seem to find the readClipboard function that should be in the utils package. Is there a way to enable the use that function from an older package? Thanks. read.DIF("clipboard") will do the same job. try that. I think it is possible however to integrate old utils packages. You can download and install them from here I think you may be after: readLines("clipboard") However, for an OS independent approach see this GitHub package, overflow's , readClip function. You can also read from the clipboard with read.table and read.csv read.table("clipboard", ...) ## or read.csv

I'd like to create a screen that only shows once after the application starts. Afterward, then it will only show the main screen. The way I implemented this was just to check the preferences and set the current layout based on a flag. Are there any draw backs to implementing it this way? Is there a better way? @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); //Here is the main layout setContentView(R.layout.main); mPrefs = PreferenceManager.getDefaultSharedPreferences(this); // second argument is the default to use if the preference can't be found

I'm reading the value of an INF file, now I need to compare it with the installer version, but when I compile I get an error: Unknown identifier: CompareVersion What is wrong? [Code] function GetKeyValue(const AKeyName, AFileName, ADefault: string): string; var I: Integer; KeyPos: Integer; KeyFull: string; FileLines: TArrayOfString; begin Result := ADefault; if LoadStringsFromFile(AFileName, FileLines) then begin KeyFull := AKeyName + '='; for I := 0 to GetArrayLength(FileLines) - 1 do begin FileLines[I] := TrimLeft(FileLines[I]); KeyPos := Pos(KeyFull, FileLines[I]); if KeyPos > 0 then begin