What does FILE mean in Ruby

Question

I see this all the time in Ruby   require File dirname   FILE              config environment      What does   FILE   mean

User · Answer

FILE   is the filename with extension of the file containing the code being executed   In foo rb    FILE   would be  foo rb    If foo rb were in the dir  home josh then File dirname   FILE    would return  home josh

User · Answer

It is a reference to the current file name  In the file foo rb    FILE   would be interpreted as  foo rb    Edit  Ruby 1 9 2 and 1 9 3 appear to behave a little differently from what Luke Bayes said in his comment  With these files     test rb puts   FILE   require    dir2 test rb      dir2 test rb puts   FILE     Running ruby test rb will output  test rb  full path to dir2 test rb

User · Answer

The value of   FILE   is a relative path that is created and stored  but never updated  when your file is loaded  This means that if you have any calls to Dir chdir anywhere else in your application  this path will expand incorrectly   puts   FILE   Dir chdir          puts   FILE     One workaround to this problem is to store the expanded value of   FILE   outside of any application code  As long as your require statements are at the top of your definitions  or at least before any calls to Dir chdir   this value will continue to be useful after changing directories    MY FILE PATH   File expand path File dirname   FILE        open class and do some stuff that changes directory  puts  MY FILE PATH

User · Answer

In Ruby  the Windows version anyways  I just checked and   FILE   does not contain the full path to the file  Instead it contains the path to the file relative to where it s being executed from    In PHP   FILE   is the full path  which in my opinion is preferable   This is why  in order to make your paths portable in Ruby  you really need to use this   File expand path File dirname   FILE       relative path to file     I should note that in Ruby 1 9 1   FILE   contains the full path to the file  the above description was for when I used Ruby 1 8 7   In order to be compatible with both Ruby 1 8 7 and 1 9 1  not sure about 1 9  you should require files by using the construct I showed above

User · Answer

The value of   FILE   is a relative path that is created and stored  but never updated  when your file is loaded  This means that if you have any calls to Dir chdir anywhere else in your application  this path will expand incorrectly   puts   FILE   Dir chdir          puts   FILE     One workaround to this problem is to store the expanded value of   FILE   outside of any application code  As long as your require statements are at the top of your definitions  or at least before any calls to Dir chdir   this value will continue to be useful after changing directories    MY FILE PATH   File expand path File dirname   FILE        open class and do some stuff that changes directory  puts  MY FILE PATH

User · Answer

FILE   is the filename with extension of the file containing the code being executed   In foo rb    FILE   would be  foo rb    If foo rb were in the dir  home josh then File dirname   FILE    would return  home josh

User · Answer

In Ruby  the Windows version anyways  I just checked and   FILE   does not contain the full path to the file  Instead it contains the path to the file relative to where it s being executed from    In PHP   FILE   is the full path  which in my opinion is preferable   This is why  in order to make your paths portable in Ruby  you really need to use this   File expand path File dirname   FILE       relative path to file     I should note that in Ruby 1 9 1   FILE   contains the full path to the file  the above description was for when I used Ruby 1 8 7   In order to be compatible with both Ruby 1 8 7 and 1 9 1  not sure about 1 9  you should require files by using the construct I showed above

User · Answer

FILE   is the filename with extension of the file containing the code being executed   In foo rb    FILE   would be  foo rb    If foo rb were in the dir  home josh then File dirname   FILE    would return  home josh

User · Answer

It is a reference to the current file name  In the file foo rb    FILE   would be interpreted as  foo rb    Edit  Ruby 1 9 2 and 1 9 3 appear to behave a little differently from what Luke Bayes said in his comment  With these files     test rb puts   FILE   require    dir2 test rb      dir2 test rb puts   FILE     Running ruby test rb will output  test rb  full path to dir2 test rb

User · Answer

It is a reference to the current file name  In the file foo rb    FILE   would be interpreted as  foo rb    Edit  Ruby 1 9 2 and 1 9 3 appear to behave a little differently from what Luke Bayes said in his comment  With these files     test rb puts   FILE   require    dir2 test rb      dir2 test rb puts   FILE     Running ruby test rb will output  test rb  full path to dir2 test rb

User · Answer

FILE   is the filename with extension of the file containing the code being executed   In foo rb    FILE   would be  foo rb    If foo rb were in the dir  home josh then File dirname   FILE    would return  home josh

User · Answer

It is a reference to the current file name  In the file foo rb    FILE   would be interpreted as  foo rb    Edit  Ruby 1 9 2 and 1 9 3 appear to behave a little differently from what Luke Bayes said in his comment  With these files     test rb puts   FILE   require    dir2 test rb      dir2 test rb puts   FILE     Running ruby test rb will output  test rb  full path to dir2 test rb

[ruby] What does FILE mean in Ruby?

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