# Invocation of ruby interpreter for .rb files under bash **URL:** \ **Category:** Ruby\ **Created:** [September 25, 2008, 1:45pm UTC](https://www.ruby-forum.com/t/invocation-of-ruby-interpreter-for-rb-files-under-bash/149500 "2008-09-25T13:45:38Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![Zouplaz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/a4c791/32.png) [@Zouplaz](https://www.ruby-forum.com/u/Zouplaz)\ **Post date:** [September 25, 2008, 1:45pm UTC](https://www.ruby-forum.com/t/invocation-of-ruby-interpreter-for-rb-files-under-bash/149500/1 "2008-09-25T13:45:38Z")
Hello, this is not really related to the core language by itself but I don’t remember how to have the interpreter launched when typing foo.rb or foo (if foo is the name of the script) under bash ? I remember that I have to put something like #! /usr/ruby at the beginnin of the script but I don’t remember the right syntax and didn’t found a Google way to express it. Thanks ---
**Author:** ![Zouplaz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/a4c791/32.png) [@Zouplaz](https://www.ruby-forum.com/u/Zouplaz)\ **Post date:** [September 25, 2008, 1:51pm UTC](https://www.ruby-forum.com/t/invocation-of-ruby-interpreter-for-rb-files-under-bash/149500/2 "2008-09-25T13:51:13Z")
the first line should be #!/usr/bin/ruby or wherever your script is. Next, you have to mark the script as beeing executable . chmod +x foo.rb Note that since the first line of your script is #!/usr/bin/ruby ( or wherever your ruby binary is located ) , the script’s name doesn’t have to end with .rb. After that , you can just write : ./foo ---
**Author:** ![Zouplaz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/a4c791/32.png) [@Zouplaz](https://www.ruby-forum.com/u/Zouplaz)\ **Post date:** [September 25, 2008, 1:51pm UTC](https://www.ruby-forum.com/t/invocation-of-ruby-interpreter-for-rb-files-under-bash/149500/3 "2008-09-25T13:51:25Z")
Zouplaz wrote: > Hello, this is not really related to the core language by itself but I > don’t remember how to have the interpreter launched when typing foo.rb > or foo (if foo is the name of the script) under bash ? > > I remember that I have to put something like > #! /usr/ruby > > at the beginnin of the script but I don’t remember the right syntax and > didn’t found a Google way to express it. > > Thanks > #!/usr/bin/ruby to check the path please use: which ruby on my box it returned /usr/bin/ruby $ which ruby /usr/bin/ruby Regards ---
**Author:** ![Zouplaz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/a4c791/32.png) [@Zouplaz](https://www.ruby-forum.com/u/Zouplaz)\ **Post date:** [September 25, 2008, 1:54pm UTC](https://www.ruby-forum.com/t/invocation-of-ruby-interpreter-for-rb-files-under-bash/149500/4 "2008-09-25T13:54:27Z")
Alle Thursday 25 September 2008, Zouplaz ha scritto: > Thanks You’re almost there. It’s #! followed by a space then the path of the ruby executable: #! /usr/bin/ruby Another option is this: #! /usr/bin/env ruby This way, you don’t need to know the position of the ruby executable, but only of the env executable (which, I suppose, should be more standard). The downside is that, at least with bash, you can’t pass options to ruby. For example, the line #! /usr/bin/env ruby -w tries to get from env the path of the program ruby -w. Since ruby -w is not a program, you get an error. In the first way, instead, you can pass options to ruby: #! /usr/bin/ruby -w Stefano ---
**Author:** ![Zouplaz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/a4c791/32.png) [@Zouplaz](https://www.ruby-forum.com/u/Zouplaz)\ **Post date:** [September 25, 2008, 5:03pm UTC](https://www.ruby-forum.com/t/invocation-of-ruby-interpreter-for-rb-files-under-bash/149500/5 "2008-09-25T17:03:00Z")
On Thursday 25 September 2008 07:50 am, Lex W. wrote: > the first line should be > #!/usr/bin/ruby > or wherever your script is. ^ s/script/ruby interpreter/ > Next, you have to mark the script as beeing executable . > > chmod +x foo.rb > > Note that since the first line of your script is #!/usr/bin/ruby ( or > wherever your ruby binary is located ) , the script’s name doesn’t > have > to end with .rb. > After that , you can just write : > ./foo … assuming (I know) you are “in” the directory where the script is. Alternatively, you can: - put the script in a directory on the path that Linux searches for executables (then just type foo) (run =set | grep PATH=) - change the path which Linux searches for executables to include the path where your script is located (again, run =set | grep PATH=) - include the full path to the executable on the command line, e.g.: //foo (Just feeling pedantic, I guess.) Randy K. ---
**Author:** ![Zouplaz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/a4c791/32.png) [@Zouplaz](https://www.ruby-forum.com/u/Zouplaz)\ **Post date:** [September 25, 2008, 2:38pm UTC](https://www.ruby-forum.com/t/invocation-of-ruby-interpreter-for-rb-files-under-bash/149500/6 "2008-09-25T14:38:05Z")
You should put the following line at the beginning of the script: #!/usr/bin/env ruby Then, you should make your script executable using the chmod command: Prefacechmod +x foo.rb Now, you should be able to run the script by typing: ./foo.rb Regards, Yaser S. ---
**Author:** ![Zouplaz](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/z/a4c791/32.png) [@Zouplaz](https://www.ruby-forum.com/u/Zouplaz)\ **Post date:** [September 26, 2008, 10:16am UTC](https://www.ruby-forum.com/t/invocation-of-ruby-interpreter-for-rb-files-under-bash/149500/7 "2008-09-26T10:16:03Z")
le 25/09/2008 13:42, Zouplaz nous a dit: > Hello, this is not really related to the core language by itself but I > don’t remember how to have the interpreter launched when typing foo.rb > or foo (if foo is the name of the script) under bash ? > > I remember that I have to put something like > #! /usr/ruby > > at the beginnin of the script but I don’t remember the right syntax and > didn’t found a Google way to express it. Thanks all for you help, now the script files are executed the right way !