How to create a file in Ruby

Question

I m trying to create a new file and things don t seem to be working as I expect them too  Here s what I ve tried   File new  out txt  File open  out txt  File new  out txt   w  File open  out txt   w    According to everything I ve read online all of those should work but every single one of them gives me this   ERRNO  ENOENT  No such file or directory - out txt   This happens from IRB as well as a Ruby script  What am I missing

User · Answer

If the objective is just to create a file  the most direct way I see is    FileUtils touch  foobar txt

User · Answer

Use   File open  out txt    your-option-string     f  f write  write your stuff here       where your options are      r - Read only  The file must exist    w - Create an empty file for writing    a - Append to a file The file is created if it does not exist    r  - Open a file for update both reading and writing  The file must exist    w  - Create an empty file for both reading and writing    a  - Open a file for reading and appending  The file is created if it does not exist      In your case   w  is preferable   OR you could have   out file   File new  out txt    w        out file puts  write your stuff here        out file close

User · Answer

Try using  w   as the write mode instead of just  w    File open  out txt    w       file  file write  boo

User · Answer

Try   File open  out txt    w   do  f         f write data you want to write     end   without using the  File new  out txt

User · Answer

The directory doesn t exist  Make sure it exists as open won t create those dirs for you    I ran into this myself a while back

User · Answer

OK  now I feel stupid  The first two definitely do not work but the second two do  Not sure how I convinced my self that I had tried them  Sorry for wasting everyone s time    In case this helps anyone else  this can occur when you are trying to make a new file in a directory that does not exist

User · Answer

data    data you want inside the file     You can use File write  name of file here   data

User · Answer

You can also use constants instead of strings to specify the mode you want  The benefit is if you make a typo in a constant name  your program will raise an runtime exception   The constants are File  RDONLY or File  WRONLY or File  CREAT  You can also combine them if you like   Full description of file open modes on ruby-doc org

User · Answer

File new and File open default to read mode   r   as a safety mechanism  to avoid possibly overwriting a file  We have to explicitly tell Ruby to use write mode   w  is the most common way  if we re going to output to the file   If the text to be output is a string  rather than write   File open  foo txt    w      fo  fo puts  bar      or worse   fo   File open  foo txt    w   fo puts  bar  fo close   Use the more succinct write   File write  foo txt    bar     write has modes allowed so we can use  w    a    r   if necessary   open with a block is useful if you have to compute the output in an iterative loop and want to leave the file open as you do so  write is useful if you are going to output the content in one blast then close the file   See the documentation for more information

[ruby] How to create a file in Ruby

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