How do I script a yes response for installing programs

Question

I work with Amazon Linux instances and I have a couple scripts to populate data and install all the programs I work with  but a couple of the programs ask   Do you want to continue  Y n     and pause the install   I want to auto answer  Y  in all cases  I m just now sure how to do it

User · Answer

Although this may be more complicated heavier-weight than you want  one very flexible way to do it is using something like Expect  or one of the derivatives in another programming language    Expect is a language designed specifically to control text-based applications  which is exactly what you are looking to do  If you end up needing to do something more complicated  like with logic to actually decide what to do answer next   Expect is the way to go

User · Answer

The  yes  command will echo  y   or whatever you ask it to  indefinitely   Use it as   yes   command-that-asks-for-input   or  if a capital  Y  is required   yes Y   command-that-asks-for-input

User · Answer

You just need to put -y with the install command   For example  yum install  lt package to install gt  -y

User · Answer

echo y   command should work   Also  some installers have an  auto-yes  flag  It s -y for apt-get on Ubuntu

User · Answer

You might not have the ability to install Expect on the target server   This is often the case when one writes  say  a Jenkins job    If so  I would consider something like the answer to the following on askubuntu com    https   askubuntu com questions 338857 automatically-enter-input-in-command-line  printf  y nyes nno nmaybe n      script that needs user input   Note that in some rare cases the command does not require the user to press enter after the character  in that case leave the newlines out   printf  yyy      script that needs user input   For sake of completeness you can also use a here document     script that needs user input  lt  lt  EOF y y y EOF   Or if your shell supports it a here string     script  lt  lt  lt   y y y     Or you can create a file with one input per line     script  lt  inputfile   Again  all credit for this answer goes to the author of the answer on askubuntu com  lesmana

User · Answer

If you want to just accept defaults you can use    n     shell being run

[linux] How do I script a "yes" response for installing programs?

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