How do I feed ruby code into rails console and irb from terminal?





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1















In terminal, I want to do something like:



rails c << 'puts User.count'

irb << 'puts "Hello World!!"'


And get results like following:



1278 # for rails c

Hello World # for irb


What is the right way to do this?






ruby-on-rails ruby







share|improve this question


















  • 3





    Not << - you want <<< (so-called "here string"). e.g. irb <<< 'puts "Hello World!!"' does what you want.

    – Amadan
    Jan 4 at 6:27













  • @Amadan Maybe I misunderstood, but it looks like he is looking for eval, please correct me.

    – ray
    Jan 4 at 6:33






  • 3





    @ray: No, he wants to "feed ruby code into rails console and irb from terminal". Not run irb and then type code; but to use one command in shell to run certain code inside irb. My comment solves it for bash; Зелёный gives a rails-specific solution.

    – Amadan
    Jan 4 at 6:35




















1















In terminal, I want to do something like:



rails c << 'puts User.count'

irb << 'puts "Hello World!!"'


And get results like following:



1278 # for rails c

Hello World # for irb


What is the right way to do this?






ruby-on-rails ruby







share|improve this question


















  • 3





    Not << - you want <<< (so-called "here string"). e.g. irb <<< 'puts "Hello World!!"' does what you want.

    – Amadan
    Jan 4 at 6:27













  • @Amadan Maybe I misunderstood, but it looks like he is looking for eval, please correct me.

    – ray
    Jan 4 at 6:33






  • 3





    @ray: No, he wants to "feed ruby code into rails console and irb from terminal". Not run irb and then type code; but to use one command in shell to run certain code inside irb. My comment solves it for bash; Зелёный gives a rails-specific solution.

    – Amadan
    Jan 4 at 6:35
















1












1








1








In terminal, I want to do something like:



rails c << 'puts User.count'

irb << 'puts "Hello World!!"'


And get results like following:



1278 # for rails c

Hello World # for irb


What is the right way to do this?






ruby-on-rails ruby







share|improve this question














In terminal, I want to do something like:



rails c << 'puts User.count'

irb << 'puts "Hello World!!"'


And get results like following:



1278 # for rails c

Hello World # for irb


What is the right way to do this?






ruby-on-rails ruby




ruby-on-rails ruby






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Jan 4 at 6:23









Henry YangHenry Yang

3801416




3801416








  • 3





    Not << - you want <<< (so-called "here string"). e.g. irb <<< 'puts "Hello World!!"' does what you want.

    – Amadan
    Jan 4 at 6:27













  • @Amadan Maybe I misunderstood, but it looks like he is looking for eval, please correct me.

    – ray
    Jan 4 at 6:33






  • 3





    @ray: No, he wants to "feed ruby code into rails console and irb from terminal". Not run irb and then type code; but to use one command in shell to run certain code inside irb. My comment solves it for bash; Зелёный gives a rails-specific solution.

    – Amadan
    Jan 4 at 6:35
















  • 3





    Not << - you want <<< (so-called "here string"). e.g. irb <<< 'puts "Hello World!!"' does what you want.

    – Amadan
    Jan 4 at 6:27













  • @Amadan Maybe I misunderstood, but it looks like he is looking for eval, please correct me.

    – ray
    Jan 4 at 6:33






  • 3





    @ray: No, he wants to "feed ruby code into rails console and irb from terminal". Not run irb and then type code; but to use one command in shell to run certain code inside irb. My comment solves it for bash; Зелёный gives a rails-specific solution.

    – Amadan
    Jan 4 at 6:35










3




3





Not << - you want <<< (so-called "here string"). e.g. irb <<< 'puts "Hello World!!"' does what you want.

– Amadan
Jan 4 at 6:27







Not << - you want <<< (so-called "here string"). e.g. irb <<< 'puts "Hello World!!"' does what you want.

– Amadan
Jan 4 at 6:27















@Amadan Maybe I misunderstood, but it looks like he is looking for eval, please correct me.

– ray
Jan 4 at 6:33





@Amadan Maybe I misunderstood, but it looks like he is looking for eval, please correct me.

– ray
Jan 4 at 6:33




3




3





@ray: No, he wants to "feed ruby code into rails console and irb from terminal". Not run irb and then type code; but to use one command in shell to run certain code inside irb. My comment solves it for bash; Зелёный gives a rails-specific solution.

– Amadan
Jan 4 at 6:35







@ray: No, he wants to "feed ruby code into rails console and irb from terminal". Not run irb and then type code; but to use one command in shell to run certain code inside irb. My comment solves it for bash; Зелёный gives a rails-specific solution.

– Amadan
Jan 4 at 6:35














2 Answers
2






active

oldest

votes


















6














You can use rails runner:



bin/rails runner "puts User.count"






share|improve this answer































    0














    You can use eval method



    which evaluates the ruby expression in the string.



    For example in your case both in rails console or irb or for pry lovers, you can
    do the following



    eval "puts User.count" #your User model count



    eval 'puts "Hello World!!"' #Hello World






    share|improve this answer
























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      2 Answers
      2






      active

      oldest

      votes








      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      6














      You can use rails runner:



      bin/rails runner "puts User.count"






      share|improve this answer




























        6














        You can use rails runner:



        bin/rails runner "puts User.count"






        share|improve this answer


























          6












          6








          6







          You can use rails runner:



          bin/rails runner "puts User.count"






          share|improve this answer













          You can use rails runner:



          bin/rails runner "puts User.count"







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Jan 4 at 6:33









          ЗелёныйЗелёный

          30.3k75371




          30.3k75371

























              0














              You can use eval method



              which evaluates the ruby expression in the string.



              For example in your case both in rails console or irb or for pry lovers, you can
              do the following



              eval "puts User.count" #your User model count



              eval 'puts "Hello World!!"' #Hello World






              share|improve this answer




























                0














                You can use eval method



                which evaluates the ruby expression in the string.



                For example in your case both in rails console or irb or for pry lovers, you can
                do the following



                eval "puts User.count" #your User model count



                eval 'puts "Hello World!!"' #Hello World






                share|improve this answer


























                  0












                  0








                  0







                  You can use eval method



                  which evaluates the ruby expression in the string.



                  For example in your case both in rails console or irb or for pry lovers, you can
                  do the following



                  eval "puts User.count" #your User model count



                  eval 'puts "Hello World!!"' #Hello World






                  share|improve this answer













                  You can use eval method



                  which evaluates the ruby expression in the string.



                  For example in your case both in rails console or irb or for pry lovers, you can
                  do the following



                  eval "puts User.count" #your User model count



                  eval 'puts "Hello World!!"' #Hello World







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Jan 4 at 16:12









                  Kevyne SantosKevyne Santos

                  11




                  11






























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